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Mantle and mantle related geology samples

Mantle Geology online catalog page 6

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Conditions of Sale

Mineralogy samples from the Earth's mantle are some of the rarest and most difficult geologic materials for educators, collectors and the scientific community to acquire. The samples listed are offered on a first-come, first serve basis and guaranteed to be exactly as described. All are enclosed and protected in a 2" x 2" acrylic case that may be opened for examination. Master Card, VISA, PayPal accepted. Checks are welcome but please email us first so that we may confirm availability and hold the material until your check arrives.

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Questions on any specimens? lab@petrologyslides.com

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Okaite in acrylic case Kimberlite, Chicken Park,
in acrylic case
Kimberlite, Echo Bay
in acrylic case
     
 
     

 
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Harzburgite, Kimberley, South Africa

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Harzburgite, Kimberley, South Africa

Harzburgite, Kimberley Mine, South Africa. {short description of image}

Harzburgite, Kimberley, South Africa.


Harzburgite's are a variety of peridotite and a major component of the upper mantle where they occur as xenoliths in mantle-derived magmas. They are an ultrabasic igneous rock dominated by olivine, and low calcium pyroxene. Harzburgite 's take their name from the Harz Mountains in Germany.
This one is from the world famous De Beer's mine in Kimberley, South Africa.


Polished slice, in a 2'x2' acrylic case, $28.00

Specimen# 101-233


 
{short description of image} Analcime, apatite, biotite, diopside, ilmenite, phlogopite, richterite. {short description of image}

Lamproite, Rabbit Ears, Colorado

Lamproite, Rabbit Ears, Middle Park, Colorado {short description of image}

Lamproite, Rabbit Ears, Colorado



The origin of lamproites is obscure. They are related to kimberlites and can be diamond-bearing. They are porphyritic ultrapotassic igneous rocks dominated by phlogopite, olivine, diopside, and probably form at depths of 150km or greater in the mantle.
The Rabbit Ears lamproite is 33mya in age. It's from a lamproite pluton exposed in basalt-rhyolite near Middle Park, Colorado.


Polished slice, in a 2'x2' acrylic case, $28.00

Specimen# 102-145


 
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Dunite, Robert Victor Mine

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Dunite, Robert Victor Mine

Dunite, Robert Victor Mine, South Africa {short description of image}

Dunite, Robert Victor Mine


Dunite is an igneous, ultramafic, plutonic rock with a coarse-grained texture. It is composed of more than 90% olivine with minor amounts of pyroxene, chromite, magnetite, and pyrope. It's a variety of peridotite and is one of the major constituents of the Earth's mantle. Dunite always contains some metallic minerals - chromite, magnetite and is a source of valuable ores and minerals, including platinum, nickel.
From the famous Robert Victor Mine, now called the Rovic Diamond Mine, in Free State Province, South Africa.
Polished slice, in a 2'x2' acrylic case, $28.00

Specimen# 103-236


 
{short description of image} Arfvedsonite, orthoclase, plagioclase feldspars, hornblende, amphibole, clinopyroxene, biotite. {short description of image}

Arfvedsonite in syenite.

Arfvedsonite Syenite, Aspirus site, Wausau pluton, Wisconsin {short description of image}

Arfvedsonite in syenite.


The Wausau Intrusive complex is a Proterozoic group of plutons in Marathon County, Wisconsin.
Syenite is an igneous rock that cooled slowly in the Earth's crust similar to granite. Arfvedsonite is a rare sodium amphibole mineral that typically occurs as greenish black to bluish grey stellate prisms.
This specimen is from the Stettin complex of syenites and has arfvedsonite prisms in syenite in each sample.




Polished slice, in a 2'x2' acrylic case, $24.00

Specimen# 104-154


 
{short description of image} Diopside, leucite, phlogopite lamproite {short description of image}

Vesicular Wyomingite Lamproite

Vesiclular Wyomingite Lamproite, Lucite Hills, Wyoming, USA {short description of image}

Vesicular Wyomingite Lamproite


Vesicular Wyomingite is diopside, phlogopite, and lamproite from Leucite Hills.
Wyoming's Leucite Hills include a group of rare lamproitic volcanic flows containing unusual minerals - richterite, armalcolite, magesiochromite and noonkanbahite.


Polished slice, in a 2'x2' acrylic case, $28.00

Specimen# 105-155



 
{short description of image} High in Wustite (FeO), Titanium dioxide {short description of image}

Greenland Basalt

Greenland Basalt, South of Scoresbysund {short description of image}

Greenland Basalt


The Scoresbysund area of southern Greenland has a varied geologic record that spans almost 3 billion years. This basalt is from the Blosseville Coast. A rifting process led to intense volcanism in this area 55 million years ago with large volumes of basalts covering most of southern Greenland. The basalts in this area are high in FeO and titanium dioxide.


Polished slice, in a 2'x2' acrylic case, $24.00

Specimen# 106-143


 
{short description of image} Nepheline, sodalite, hauyne, leucite, analcite, sanidine, anorthoclase, sodic plagioclase, biotite, Fe-rich olivine. {short description of image}

.Phonolite, Dunedin Volcano

Phonolite, Dunedin Volcano, New Zealand {short description of image}

.Phonolite, Dunedin Volcano


Phonolite is an uncommon extrusive, igneous, volcanic rock ranging in chemical composition between felsic and mafic. The textures are fine-grained to mixed (porphyritic). The name, derived from Greek meaning "sounding stone" is from the metallic sound it produces when struck. The English name is "clinkstone" From the Dunedin Volcano, an extinct shield volcano that last erupted around 10 million years ago.

Polished slice, in a 2'x2' acrylic case, $24.00

Specimen# 107-151


 
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Zircon assemblage

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Zircon

Zircon, Blue Mountain, Victoria, Australia {short description of image}

.Zircon


Zircons derived from alkali volcanoes generally show rounding from magmatic corrosion. Colors are typically orange-red to brown. Zircons are some of the oldest known, unaltered mineralogy on Earth with some dating to over 4.3 billion years. These zircon assemblages range from 10 to 15mm in size.


2 specimens in a 2'x2' acrylic case, $26.00

Specimen# 108-203


 
{short description of image} Pyroxene omphacite and pyrope-rich garnet. {short description of image}

Eclogite, Israel

Eclogite, south Israel, Negev Region {short description of image}

.Eclogite, Israel


Eclogites are high pressure, high temperature, coarse-grained metamorphic rock. They consist of pink-red garnet, and a sodium-rich variety of omphacite. They form when basalt or gabbro descend deeply into the Earth at subduction zones. At high pressure and temperatures the original minerals morph into the denser minerals granet and omphacite becoming eclogite. Because of their density, eclogites rarely return to the surface. This one is from southern Israel, the Negev Region.


Offered as a polished slice, in a 2'x2' acrylic case, $30.00

Specimen# 109-281


 
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Reunion Island basalt

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Reunion Island basalt

Basalt, Reunion Island, Indian Ocean {short description of image}

Reunion Island basalt


More basalt is in the Earth's crust than any other rock and ocean hotspots, such as Reunion Island (an overseas island of France), are primary locations for basalt to occur. This basalt is from one of the most active volcanoes on Earth, the shield volcano Piton de la Fournaise on the eastern end of the island. Since the 17th century, approximately 150 eruptions have occurred.

Offered in polished slices
Polished slice, in a 2'x2' acrylic case, $24.00

Specimen# 110-207


 
{short description of image} Plagioclase, pyroxene, magnetite, zircon, apatite, ilmenite, biotite, and garnet. {short description of image}

Phenocrystic Andesite

Phenocrystic Andesite, Hakone volcano, Japan {short description of image}

Phenocrystic Andesite


This is an extrusive igneous, volcanic rock with a porphyritic texture. It is intermediate between basalt and dacite. From the Hakone volcano in Honshu, Japan.

The Hakone volcano is a massive stratovolcano truncated by two huge overlapping calderas, each 11 x 10 km wide. A valley in one of the calderas with intense hydrothermal activity is called "Great Boiling Valley". The last magmatic eruption from Hakone was approximately 2900 years ago.

Offered in polished slices
Polished slice, in a 2'x2' acrylic case, $24.00

Specimen# 111-232


 
{short description of image} Orthoclase, albite, perthite, microcline, olivine, pyroxene, biotite, titanite, iron oxides, apatite, fluorite, melanite garnet, and zircon. {short description of image}

Sodalite replacing nepheline

Sodalite replacing Nepheline, Nepheline Syenite, Mont St. Hilaire, Quebec {short description of image}

Sodalite replacing Nepheline


Nepheline syenites are rare. They are distinguished from ordinary syenites not only by the presence of nepheline but also with the occurrence of many other alkali-rich minerals, rare earths, and other incompatible elements. Sodalite is a pale blue and the main feldspathoid mineral, in addition to nepheline, in syenites.
In this specimen of nepheline syenite from Mont St. Hilaire, Quebec, Canada, sodalite is replacing the nepheline.

Offered in polished slices
Polished slice, in a 2'x2' acrylic case, $28.00

Specimen# 112-283


 
{short description of image} Cr-pyrope, eclogite-websteritic garnets, chrome diopside, spinel, perovskite and spinel {short description of image}

Kimberlite, southern Baffin Island

Kimberlite, Southern Baffin Island, Canada {short description of image}

Kimberlite, southern Baffin Island.


This is a difficult kimberlite locality to acquire. Most of Baffin Island lies above the Artic circle in the northeastern region of Canada.

The kimberlites of this region are diamond bearing, studded with olivine macrocrysts and phenocrysts and an abundance of mantle derived xenocrysts - Cr-pyrope, eclogite-websteritic garnets, chrome diopside, spinel, perovskite and spinel

Offered in polished slices
Polished slice, in a 2'x2' acrylic case, $30.00

Specimen# 113-274


 
{short description of image} High silicon dioxide and lower titanium dioxide/silicon dioxide ratios than other local area basalts. {short description of image}

Basalt, Milne Land formation, East Greenland

Basalt, Milne Land Formation, East Greenland {short description of image}

Basalt, Milne Land formation, East Greenland


The East Greenland Milne Land Formation basalts in the Prisen of Wales Bjerge are quite distinct in that they have high silicon dioxide and lower titanium dioxide/silicon dioxide ratios than other plateau basalts (Scoresbysund) in the area. This is convincing evidence that they do not belong to the Milne Land formation and it has been proposed that the Milne Land formation be divided into two new formal volcanic formations. This basalt is from the Prisen of Wales Bjerge.

Offered in polished slices
Polished slice, in a 2'x2' acrylic case, $28.00

Specimen# 114-208


 
{short description of image} A rare locality of olivine basalt. {short description of image}

Olivine basalt, Tahiti

Olivine Basalt, Papeete, Tahiti

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Olivine basalt, Tahiti


There is more basalt in the Earth's crust than any other rock - and they are all different. This one, a basalt from the Papeete region of Tahiti, is rich in olivine phenocrysts - mineral grains of olivine substantially larger than the submillimeter grains normally seen in olivine basalts. The olivine sand found in island beeches is a disintegration product of olivine basalts.

Offered in polished slices.
Polished slice in a 2'x2' acrylic case, $28.00

Specimen# 115-164


 
{short description of image} Chromite, oivine {short description of image}

Chromitic dunite

Chromitic dunite, Stillwater Complex, Beartooth Mountains, southern Montana {short description of image}

Chromitic dunite


The Beartooth Mountains of Montana's Stillwater Complex has one of only three platinum and palladium mines in North America. The rocks in this Complex are ultramafic & mafic intrusive igneous rocks. Common to the locality are gabbros, norites, harzburgites, chromitites, pyroxenites, and dunites. Chromitic dunites have a higher percentage of chromite than the norm.

Offered in polished slices
Polished slice, in a 2'x2' acrylic case, $29.00

Specimen# 116-228


 
{short description of image} A holocrystalline plutonic rock. {short description of image}

Nepheline
Syenite, Uganda.

Nepheline Syenite, Nepak, Uganda {short description of image}

Nepheline
Syenite, Uganda.


This is a true, classic, nepheline syenite. It's a holocrystalline plutonic rock consisting of nepheline and alkali feldspar with coloring of grey or pink and in general appearance is similar to granites. Unlike granites though, there is no quartz and they're rich in rare earths elements.

Offered in polished slices
Polished slice, in a 2'x2' acrylic case, $28.00

Specimen# 117-282


 
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Glomerolporphryitic basalt with Plagioclase phenocrysts

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Glomerolporphryitic basalt with Plagioclase phenocrysts

Glomerolporphryitic basalt with Plagioclase phenocrysts, North Bend, Washington, USA {short description of image}

Glomerolporphryitic basalt with Plagioclase phenocrysts


Glomerolporphyritic is a textural term used to describe igneous rocks that contain clusters of phenocrysts, which are large crystals in a finer-grained matrix or groundmass. This is a textbook example of the term; large, radiating plagioclase phenocrysts in basalt.

Offered in polished slices
Polished slices, in a 2'x2' acrylic case, $30.00

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Specimen# 118-288


 
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Ultramafic xenolith, Mt. Carmel, Israel

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Garnet, ultramafic xenolith, Mt. Carmel, Israel

Ultramafic xenolith from Mt. Carmel (Karem Maharal Volcano), Israel {short description of image}

Garnet ultramafic xenolith, Mt. Carmel, Israel


Volcanism in the Mt. Carmel region occurred early in the Late Cretaceous. Xenoliths from the Mt. Carmel area, Israel, are predominantly composed of high-Al clinopyroxene, pyrope-almandine garnet, spinel, and plagioclase.

Offered in polished slices
Polished slice, in a 2'x2' acrylic case, $28.00

Specimen# 119-305


 
{short description of image} Amygdaloid from Denmark. {short description of image}

An altered basalt, Denmark.

Melaphyre, Island Falster, Denmark {short description of image}

An altered basalt, Denmark.


A melaphyre is an altered basalt. In this case it's amygdaloidal, cavities filled with differing mineralogy. This one is from Island Falster, Denmark. The basaltic cavities are filled with plagioclase.

Offered in polished slices
Polished slice, in a 2'x2' acrylic case, $28.00

Specimen# 120-341


 

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