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AUGITE | A common rock-forming pyroxene mineral that forms as magma is cooling. It is an imperative sample for lessons on Bowen's reaction series ...

CARBONACEOUS SHALE | Shale is formed from the cementation and lithification of very small grains of rock, commonly mud or clay. The black color of...

CHLORITE | Chlorite is a metamorphic mineral that has undergone light alteration. During metasomatism, phyllosilicate minerals may become hydrated...

COQUINA | Composed of bone and shell fragments, coquina is nearly 100% fossil matter. Held together by a carbonate cement, this skeletal mass form...

DIORITE | The minerals within diorite can be readily identified due to their large size, and by comparing the relative abundance of each mineral, ...

DOLOSTONE | Composed primarily of carbonate material, dolostone is a more stalwart rock than its chemical cousin, limestone. It is often mined fo...

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

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

SULFUR | Sulfur is a popular mineral that forms as a soft precipitate near volcanic vents and springs. This bright yellow mineral has a distinct s...

BIOTITE GNEISS | This foliated metamorphic rock usually forms at convergent plate boundaries, and recrystallizes with immense heat and pressure GR...

BITUMINOUS COAL | Coal is formed within anoxic environments from compressed organic matter, and a worldwide source of fuel. Its vitreous sheen mak...

FINE WHITE MARBLE | Formed from limestone, this high pressure, low heat alteration leads to a large crystalline rock. Heavily mined for architectu...

BASALT | Basalt makes up a large majority of the earth's oceanic crust. Formed quickly from a magma that is rich in iron, basalt exhibits a dark c...

GABBRO | Gabbro is formed within magma chambers, deep within the earth. The chambers hold iron-rich rock melt, too heavy to reach the surface. As ...

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...

SLATE | Slate is the result of the compression of shale, but is denser and retains the fissile properties, making for an interesting exercise when...

Amphibolite sample approximately 1" (3cm) in size Formed from further pressure and thermal alteration of hornblende, fusing and foliating ...

Twelve amphibolite samples approximately 1" (3cm) in size Formed from further pressure and thermal alteration of hornblende, fusing and fo...

Argillaceous shale sample approximately 1" (3cm) in size Small clast size indicates deposition in a low-energy environment such as a shallow lake ...

Pack of 12 Argillaceous shale samples approximately 1" (3cm) in size Small clast size indicates deposition in a low-energy environment such as a s...

Arkose sample approximately 1" (3cm) in size Small, angular grains indicate deposition in an ephemeral river system near to the clast sour...

Twelve arkose samples approximately 1" (3cm) I size Small, angular grains indicate deposition in an ephemeral river system near to the cla...

Augen gneiss sample approximately 1" (3cm) in size Ideal for students learning about differential stresses and foliation in metamorphic ro...

Twelve augen gneiss samples approximately 1" (3cm) in size Ideal for students learning about differential stresses and foliation in metamo...