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GRAY LIMESTONE | The massive, gray variety of limestone is often found deposited in marine environments. It is made up of organic material, primar...

GREEN SLATE | Slate is very lightly metamorphosed and well-foliated. This appearance often makes it difficult to distinguish from its parent rock,...

GREEN SLATE | Slate is very lightly metamorphosed and well-foliated. This appearance often makes it difficult to distinguish from its parent rock,...

GREYWACKE | Graywacke is a sedimentary rock composed of large, angular clasts within a fine-grained clay matrix. Formed during underwater avalanch...

GYPSUM | A sulfate mineral that often forms from evaporating lakes in what is known as an evaporite deposit. Crystals grow into soft, wide sheets,...

GYPSUM | A sulfate mineral that often forms from evaporating lakes in what is known as an evaporite deposit. Crystals grow into soft, wide sheets,...

HALITE | Halite is commonly known as table salt. This soft, white to transparent mineral grows into cleavable cubes GREAT FOR GEOLOGY CLASSROOMS |...

HALITE | Halite is commonly known as table salt. This soft, white to transparent mineral grows into cleavable cubes GREAT FOR GEOLOGY CLASSROOMS |...

HEMATITE | This specular variety of hematite takes the form of tiny, sparkling iron oxide crystals GREAT FOR GEOLOGY CLASSROOMS | Perfect for demo...

HEMATITE | Hematite is made up of iron and oxygen, giving it a distinct red, earthy color. Although hematite can form in a variety of appearances,...

HORNBLENDE | Hornblende is part of a group of minerals known as amphiboles. These minerals are chemically and structurally similar to pyroxenes, b...

LABRADORITE | Labradorite is a variety of plagioclase feldspar, intermediate between anorthite and albite. Notable about this species of feldspar ...

LIMESTONE CHALK | Limestone is made up of organic material, primarily calcium carbonate. The chalk variety consists of the shells of coccolithopho...

LODESTONE | This naturally magnetized mineral creates it's own magnetic field and can pick up small metal objects. Iron particles cover its surfac...

MAGNETITE | Magnetite forms as an accessory mineral from an igneous melt. As it cools, the iron in its atomic structure becomes magnetized GREAT F...

MICA SCHIST | A metamorphic rock that has undergone moderate levels of alteration, schist is good for demonstrating the effect of metamorphism on ...

MICROCLINE | One of the most common minerals in the earth's crust, feldspar has a variety of physical properties that make it a quintessential min...

MILKY QUARTZ | One of the most abundant minerals on Earth. The tightly packed framework of silica tetrahedral that makes up this mineral gives it ...

MUSCOVITE MICA | Muscovite mica is a mineral that forms from cooling magma. It forms in thin sheets that are individually weak, but comprehensivel...

MUSCOVITE MICA | Muscovite mica is a mineral that forms from cooling magma. It forms in thin sheets that are individually weak, but comprehensivel...

Raw Obsidian SpecimenSingle Sample, 1" OBSIDIAN | Obsidian, also known as volcanic glass, forms from lava that cools almost immediately upon eru...

Raw Obsidian SpecimenHand Sample, 3" OBSIDIAN | Obsidian, also known as volcanic glass, forms from lava that cools almost immediately upon erupt...

OLIVINE | Much of the earth's surface is covered in oceanic crust, of which olivine is a major component. With the highest crystallization tempera...

PERIDOTITE | Peridotite is an iron-rich ultramafic rock, with a chemistry that suggests genesis from a point deep within the crust, possibly as de...

PHYLLITE | Phyllite is a good example of low-grade metamorphism from an easily recognizable parent rock. The fissile property of slate is retained...

PINK GRANITE | Commonly found as magmatic intrusions in the crust, granite forms slowly in shallow or evolved magma chambers. The large crystals a...

PORPHYRITIC GRANITE | Granite forms slowly in shallow or evolved magma chambers, and is also commonly found as magmatic intrusions in the crust. T...

PUMICE | Pumice is formed from the frothy lava that a volcanic explosion creates. As the frothy lava cools, it hardens as a light weight rock that...

PUMICE | Pumice is formed from the frothy lava that a volcanic explosion creates. As the frothy lava cools, it hardens as a light weight rock that...

PYRITE | Pyrite forms as hot water flows through fractures in subsurface rock. This deposition method allows pyrite to replace other minerals or f...

QUARTZ | One of the most abundant minerals on Earth. The tightly packed framework of silica tetrahedral that makes up this mineral gives it a high...

QUARTZITE | Applying significant pressure to sandstone results in the formation of quartzite. The compaction of sandstone's sturdy silicate framew...

RED SANDSTONE | Sandstone is made up of well-sorted and well-rounded grains of quartz. This indicates that the clasts in the rocks have traveled a...

RED SLATE | Slate is very lightly metamorphosed and well-foliated. This appearance often makes it difficult to distinguish from its parent rock, s...

RED SLATE | Slate is very lightly metamorphosed and well-foliated. This appearance often makes it difficult to distinguish from its parent rock, s...

RHYOLITE | Rhyolite is an aphanitic felsic rock which forms during eruptions of thick, viscous magma. Often containing phenocrysts of felsic miner...