Fibrous actinolite is one of the six recognized types of asbestos, the fibers being so small that they can enter the lungs and damage the alveoli.

Fibrous actinolite is one of the six recognized types of asbestos, the fibers being so small that they can enter the lungs and damage the alveoli.

A dark green to greenish black stone sometimes used as a gemstone.

These three minerals commonly occur together in alkaline igneous rocks, metasomatic zones, and high-grade metamorphic environments. When they appear together on a specimen, the contrast of dark aegirine, honey-brown titanite, and pistachio-green clinozoisite is visually striking and highly collectible.

Afghanite is, best known for its intense blue color and occurrence in the famous Lapis Lazuli deposits of Badakhshan

Purple, spherical chalcedony resembling bunches of grapes.

A type of translucent, microcrystalline quartz primarily mined in Brazil, known for its vibrant colors and beautiful banding patterns.

A vibrant, multicolored variety of chalcedony known for its intricate swirling patterns and complex color combinations, primarily found in Mexico.

The most valuable variety of quartz, and the birth stone of February.

Amazonite, also known as amazonstone,[4] is a green tectosilicate mineral, a variety of the potassium feldspar called microcline.

Anatase is a mineral form of titanium dioxide that's found in nature as hard, brilliant crystals. It's one of three naturally occurring crystalline phases of titanium dioxide, along with rutile and brookite. 

Rare earth bearing mineral.

A magnesium mineral used in the manufacturing of asbestos.

Apache Tear is an obsidian nodule with a unique name, the name comes from a popularized legend about an event said to have happened in the 1870s near what is now Apache Leap, close to Superior, Arizona.

Apophyllite's unique tetragonal crystal structure and optical properties are of interest to mineralogists and geology students.

A pale blue to light green variety of Beryl, often used as a gemstone.

A commonly occurring calcium carbonate formed by biological and physical processes, including precipitation from marine environments.

An iron arsenic sulfide mineral that looks like a silvery fools gold.

A copper oxychloride, Atacamite often occurs in association with chrysocolla, is used in agriculture as a plant protection agent (fungicide).

A carbonate mineral, usually found as a secondary mineral in copper and zinc deposits.

A Uranium bearing mineral that glows under UV, very fragile and radioactive.

A copper bearing mineral, which is a weathered version of Malachite.