Erionite: Properties and Occurrences

Erionite: Properties and Occurrences

Erionite is a naturally occurring fibrous mineral that belongs to a group of minerals called zeolites. It is one of the rarer zeolites, a popular…
Ericssonite

Ericssonite

Ericssonite has a general formula of BaMn2FeO[Si2O7](OH). It is a monoclinic-prismatic reddish black mineral containing barium, hydrogen, iron, manganese, oxygen, and silicon. It is usually…
Epsomite: Properties and Occurrences

Epsomite: Properties and Occurrences

Epsomite is a hydrous magnesium sulfate mineral with formula MgSO4·7H2O. It was first systematically described in 1806 for an occurrence near Epsom, Surrey, England, after…
Epidote: Properties and Occurrences

Epidote: Properties and Occurrences

Epidote is a calcium aluminum iron sorosilicate mineral. The color is green, grey, brown or nearly black, but usually a characteristic shade of yellowish-green or…
Ephesite: Properties and Occurrence

Ephesite: Properties and Occurrence

Ephesite is a rare member of the mica silicate mineral group, phyllosilicate. It is a monoclinic-prismatic mineral containing aluminum, hydrogen, lithium, oxygen, silicon, and sodium.…
Eosphorite: Properties and Occuurrence

Eosphorite: Properties and Occuurrence

Eosphorite is a brown (occasionally pink) manganese hydrous phosphate mineral with chemical formula: MnAl(PO4)(OH)2·H2O. It is used as a gemstone. It is an orthorhombic-dipyramidal mineral…
Enstatite: Properties and Occurrences

Enstatite: Properties and Occurrences

Enstatite is a mineral; the magnesium endmember of the pyroxene silicate mineral series enstatite (MgSiO3) – ferrosilite (FeSiO3). It is a translucent crystalline mineral that…
Enargite: Properties and Occurrences

Enargite: Properties and Occurrences

Enargite is a copper arsenic sulfosalt mineral with formula: Cu3AsS4. It is a dark grey mineral consisting of a sulfide of copper and arsenic. It…
Emmonsite

Emmonsite

Emmonsite, also known as durdenite, is an iron tellurite mineral with the formula: Fe2(TeO3)3·2(H2O). It is a triclinic-pinacoidal mineral containing hydrogen, iron, oxygen, and tellurium.…
Empressite

Empressite

Empressite is a mineral form of silver telluride, AgTe. It is a rare, grey, orthorhombic mineral with which can form compact masses, rarely as bipyrimidal…
Elbaite: Properties and Occurrences

Elbaite: Properties and Occurrences

Elbaite, a sodium, lithium, aluminum boro-silicate, with the chemical composition Na(Li1.5Al1.5)Al6Si6O18(BO3)3(OH)4, is a mineral species belonging to the six-member ring cyclosilicate tourmaline group. It is…
Efremovite

Efremovite

Efremovite is a rare ammonium sulfate mineral with the chemical formula: (NH4)2Mg2(SO4)3. It is an isometric-tetartoidal mineral containing hydrogen, magnesium, nitrogen, oxygen, and sulfur. It…
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