Anthophyllite

The name anthophyllite comes from the Latin word anthophyllum, which means “clove”—a reference to the mineral’s clove-brown to dark brown color. Specimens can also be pale green, gray, or white. Anthophyllite is usually found in columnar to fibrous…

Glaucophane

The Glaucophane mineral is named after two Greek words: glaukos, which means “bluish green”; and phainesthai, which means “to appear.” Specimens can be gray, lavender blue, or bluish black. Crystals are slender, often lathlike…

Nepheline

Nepheline – USGS Mineral Specimens Nepheline is the most common feldspathoid mineral in the world, its name from the Greek word nephele, which means “cloud” a reference to the fact that the mineral becomes cloudy or milky in strong acids.…

Aquamarine

Aquamarine is a beautiful gemstone and a variety of the mineral beryl. It is highly prized for its stunning blue to greenish-blue color, reminiscent of the clear waters of the sea, which gives it its name “aquamarine” (aqua meaning water and marine…

Biotite

Biotite is the most common mica mineral and also known as black mica, a silicate mineral in the common mica group. Approximate chemical formula K (Mg, Fe). It can be found in massive crystal layers weighing several hundred pounds. It is abundant in metamorphic…

Mica Group Minerals

Muscovite schist_mica Mica Minerals Contents Mica Group Minerals Classification of Mica Group Minerals Dioctahedral micas Trioctahedral micas Occurrence of Mica Group Minerals Production Crystal Structure…

Anorthoclase

Anorthoclase minerals is member of the sodium- and potassium-rich feldspar group takes its name from the Greek word anorthos, which means “not straight”—a reference to its oblique cleavage. Anorthoclase is colorless, white, cream,…

Natrolite

Haineaultite-Analcime-Natrolite Bombay Quarry, Mumbai District (Bombay District), Maharashtra, India Natrolite is a tectosilicate mineral belong to zeolite group members.Its formula Na2Al2Si3O10 • 2H2O. A hydrated sodium aluminosilicate,…

Hornblende

Ferrohornblende Ferrohornblende Magnesio-hornblende Magnesio-hornblende Hornblende is a inosilicate amphibole minerals, which are two type hornblende minerals. They are ferrohornblende and magnesiohornblende. They are an isomorphous…

Perlite

Perlite is a naturally occurring volcanic glass that has been used in various industrial and horticultural applications. It is a unique mineral formed when obsidian, a type of volcanic rock, is exposed to high heat. The resulting perlite is a lightweight,…

Pyromorphite

Pyromorphite is a secondary lead mineral that forms in the oxidation zones of lead ore deposits. It is classified as a member of the apatite group of phosphates and has the chemical formula Pb5_55​(PO4_44​)3_33​Cl. The mineral is primarily composed…

Aragonite

Aragonite crystals. Aragonite is a variant of calcium carbonate, along with the mineral calcite. This sample, found in Morocco, is 4 centimetres long. crystals of Aragonite mineral stone isolated on white background Aragonite is a carbonate…