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What mineral specimens are available for decorating?

At right is a beautiful pegmatite decorator mineral specimen of cleavelandite (albite) with muscovite mica. Our clevelandite mineral specimens were mined in tourmaline bearing pegmatites in Minas Gerais, Brazil. We have a variety of natural amethyst mineral specimens available including chevron amethyst mineral specimens mined in Bahia, Brazil.

How do I see mineral specimens for a particular mineral variety?

To see mineral specimens for a particular mineral variety, just select one of the mineral specimen images (or one of mineral links listed alphabetically further down this page) or you can visit our Mineral Inventory & Factsheet Index.

What is a mineral?

Scientifically a mineral is a naturally occurring solid, formed through geological processes, that has a specific chemical composition, a highly ordered atomic structure, and definite physical properties, which is often expressed in the typical outward growth of crystals.

What must an earth material have to be considered a mineral?

List the five characteristics an Earth material must have in order to be considered a mineral. a. Naturally Occurring b. Generally Inorganic d. Orderly Crystalline Structure e. Definite chemical composition that allows for some variation

What is chrysoprase mineral?

Chrysoprase is natural color light green chalcedony. The color of our chrysoprase mineral specimens is completely natural - they are unheated and untreated. Our chrysoprase rough specimens have fine cabochon grade consistency inside, and they would yield beautiful chrysoprase cabochons.

Where is chevron amethyst mined?

We have a variety of natural amethyst mineral specimens available including chevron amethyst mineral specimens mined in Bahia, Brazil. These chevron amethyst specimens make nice mineral specimens just as they are, although they can also be used as lapidary rough to make unique carvings, cabochon gems, and spheres.

What is blue aventurine quartz used for?

Due to its relatively inexpensive price and beautiful color when wet, blue aventurine quartz has also been used as a decoration rock in fountains, aquariums, waterfalls and other indoor and outdoor landscape & design/decore projects.

Where is aventurine quartzite mined?

Our blue aventurine quartzite mineral specimens are all mined in Brazil. Each piece of our blue aventurine quartz rough is natural color, it is 100% unheated and untreated natural rough, just the way it formed inside the earth! Our blue aventurine quartz rough is all lapidary grade.

What mineral is non metallic?

Use the mineral identification key to identify a mineral that is non metallic, dark colored, harder than glass, lacking cleavage, and green in color. Olivine. For each mineral listed below, list at least one diagnostic property that could be used to help distinguish this mineral from others. Halite: Salty taste.

Why is color not a diagnostic property of quartz?

Color is not a diagnostic property of quartz because the color varies. Quartz can have the same color as other minerals making it ...

What is the name of the test that detects if a calcite is transparent?

A small drop of dilute hydrochloric acid is dropped on the Calcite to verify if it reacts in a "fizz", known as the acid test . Compare and contrast the terms Opaque, Translucent, and Transparent. Opaque, like hornblende, is when no light is transmitted.

Is quartz a good diagnostic mineral?

Quartz can have the same color as other minerals making it a not so good diagnostic character. For both samples, describe the color of the specimen and the streak. Specimen A: Brown Color, Leaves Brown Mark. Specimen B: Black Color, Leaves Brown Mark.