Germanium

Germanium

Germanium Definition Germanium is a brittle, crystalline, grayish-white metalloid element that is found in coal, in zinc ores, and in several minerals. Its atomic number…
Silicon

Silicon

Silicon Definition Silicon is a metalloid element that occurs in both gray crystalline and brown noncrystalline forms. It is the second most abundant element in…
About Brass

About Brass

About Brass Definition Brass is a yellowish alloy of copper and zinc, usually 67 percent copper and 33 percent zinc. It sometimes includes small amounts…
Tarnish

Tarnish

Tarnish Definition Tarnish is a substance which forms on the surface of some metals and which stains them or causes them to lose their brightness.…
Thorium

Thorium

Thorium Definition Thorium is a silvery-white, radioactive metallic element of the actinide series. The only naturally occurring isotope of thorium, Th 232, is also its…
Titanite

Titanite

Titanite Definition Titanite is a very rare calcium titanium silicate that is an important ore of titanium. It is also called Sphene. Its crystals are…
Datolite

Datolite

Datolite Definition Datolite is a colourless mineral consisting of a hydrated silicate of calcium and boron in monoclinic crystalline form, occurring in cavities in igneous…
Carbonatite

Carbonatite

Carbonatite Definition Carbonatite is a carbonate rock of apparent magmatic origin, generally associated with kimberlites and alkalic rocks. It has been variously explained as derived…
Hessonite

Hessonite

Hessonite Definition Hessonite is an orange-brown variety of grossularite garnet also called essonite, cinnamon stone. Its general formula: Ca3Al2Si3O12. It is also known as cinnamon…
Clinohumite

Clinohumite

Clinohumite Definition Clinohumite is a monoclinic-prismatic mineral containing fluorine, hydrogen, iron, magnesium, oxygen, and silicon. It is an uncommon member of the humite group, a…
Jerrygibbsite

Jerrygibbsite

Jerrygibbsite Definition Jerrygibbsite is a rare silicate mineral with chemical formula: (Mn,Zn)9(SiO4)4(OH)2. It is member of the leucophoenite family of the humite group. It is…
Chondrodite

Chondrodite

Chondrodite Definition Chondrodite is one of the rarest and most beautiful of gemstones and it is occasionally faceted for collectors. It is a nesosilicate mineral…
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