Chemistry

Apatite: Properties and Occurrence

Apatite: Properties and Occurrence

An apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite, and chlorapatite, with high concentrations of OH−, F−, and Cl− ions, respectively, in the crystal. The primary Apatite group includes Fluorapatite, Chlorapatite, and Hydroxylapatite. The three a.....

Read More »

Apachite: Properties and Occurrence

Apachite: Properties and Occurrence

Apachite is a copper silicate mineral with a general formula of Cu9Si10O29·11H2O. It is a phonolitic rock containing abundant amphibole and aenigmatite associated with the pyroxene and microperthite as the feldspar. The mineral was named for the Apache Indians, whose reservation is near the loca.....

Read More »

Antlerite: Properties and Occurrence

Antlerite: Properties and Occurrence

Antlerite is a greenish hydrous copper sulfate mineral, with the formula Cu3(SO4)(OH)4. It has been an important ore of copper and forms nice mineral specimens. It typically forms tabular to acicular or fibrous crystals. It forms mainly in sheltered areas where weathering is low, which permits th.....

Read More »

Antitaenite

Antitaenite

Antitaenite is a meteoritic metal alloy mineral composed of iron and nickel, 20–40% Ni (and traces of other elements) that has a face-centered cubic crystal structure. There are three other known Fe-Ni meteoritic minerals: kamacite, taenite, and tetrataenite. Originally described from Vaca Muer.....

Read More »

Antimony: Properties and Occurrence

Antimony: Properties and Occurrence

Antimony is a chemical element with symbol Sb (from Latin: stibium) and atomic number 51. A lustrous grey metalloid, it is found in nature mainly as the sulfide mineral stibnite (Sb2S3). It is a semimetallic chemical element which can exist in two forms: the metallic form is bright, silvery, hard.....

Read More »

Serpentine Subgroup

Serpentine Subgroup

The serpentine subgroup (part of the kaolinite-serpentine group) are greenish, brownish, or spotted minerals commonly found in serpentinite rocks. Besides for the main members of Antigorite and Chrysotile, a distinction is not usually made between the individual members except under scientific st.....

Read More »

Anthonyite: Properties and Occurrence

Anthonyite: Properties and Occurrence

Anthonyite is a hydrous secondary copper halide mineral with the chemical formula of Cu(OH, Cl)2•3(H2O). It is not radioactive. It was discovered in 1963 in the Centennial mine, Calumet, Houghton County, Michigan, United States. It was discovered by the University of Arizona mineralogist John W.....

Read More »

Antarcticite: Properties and Occurrence

Antarcticite: Properties and Occurrence

Antarcticite is an uncommon calcium chloride hexahydrate mineral with formula: CaCl2·6H2O. It forms colorless acicular trigonal crystals. It is an uncommon calcium chloride hexahydrate mineral. It is hygroscopic and has a low specific gravity of 1.715. It is not Radioactive. As its name implies,.....

Read More »

Anorthoclase

Anorthoclase

The mineral anorthoclase ((Na, K)AlSi3O8) is a crystalline solid solution in the alkali feldspar series, in which the sodium-aluminum silicate member exists in larger proportion. It is a member of a continuous series of feldspar minerals related to sanidine. It typically consists of between 10 an.....

Read More »

Anorthite: Properties and Occurrence

Anorthite: Properties and Occurrence

Anorthite is the calcium endmember of plagioclase feldspar. Plagioclase is an abundant mineral in the Earth’s crust. The formula of pure anorthite is CaAl2Si2O8. It is not Radioactive. Anorthite by definition must contain no more than 10% sodium and no less than 90% calcium in the sodium/ca.....

Read More »

Annite: Properties and Occurrence

Annite: Properties and Occurrence

Annite is a phyllosilicate mineral in the mica family. It has a chemical formula of KFe32+AlSi3O10(OH)2. Annite is the iron end member of the biotite mica group, the iron-rich analog of magnesium-rich phlogopite. Annite was first described in 1868 for the first noted occurrence in Cape Ann, Rockp.....

Read More »

Annabergite: Properties and Occurrence

Annabergite: Properties and Occurrence

Annabergite is an arsenate mineral consisting of a hydrous nickel arsenate, Ni3(AsO4)2·8H2O, crystallizing in the monoclinic system and isomorphous with vivianite and erythrite. It is a rare nickel mineral that can often have a bright green color. It is the end member of a series with Erythrite,.....

Read More »