Pyroxene

augite fassaiteaugite pyroxene mineralAugite Pyroxene is a set of essential rock-forming inosilicate minerals discovered in many igneous and metamorphic rocks. Pyroxenes have the general components is XY(Si,Al)2O6. Although aluminium…

Olivine

Olivine is one of the most common minerals within the earth, and is a prime rock forming mineral. Despite this, desirable specimens and huge crystals are unusual and fashionable. Only few localities yield large examples of this mineral, even though small…

Clay Minerals

Clay minerals are a group of minerals that are typically found in soils, sediments, and rocks. They are characterized by their small particle size, which is typically less than 2 micrometers, and their high surface area. Some of the most common clay minerals…

Tremolite

Tremolite,Campolungo, Piumogna Valley, Switzerland Tremolite from Franklin, Sussex Co., New Jersey, United States Tremolite is a silicate mineral and member of the amphibole group. Chemical formula is Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2.…

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…

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.…

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,…

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,…

Eosphorite

Eosphorite is a mineral belonging to the group of phosphates. It typically forms in pegmatite veins, which are coarse-grained igneous rocks found in association with granite. Eosphorite is known for its distinctive pink to purple coloration, often with…