Coesite
Coesite is a very unusual mineral, and it is silica, silicon dioxide (SiO2), high-pressure polymorph (cristal form). It is produced when quartz is exposed to…
Geographic Minerals
Trachyte
Trachyte is an igneous volcanic rock consisting primarily of alkali feldspar with small quantities of dark minerals such as biotite, amphibole, or pyroxene. It is…
Messelite: properties and Occurrences
Messelite is a mineral with formula Ca2(Fe2+, Mn2+)(PO4)2·2H2O. It is a triclinic-pinacoidal mineral containing calcium, hydrogen, iron, manganese, oxygen, and phosphorus. It was discovered in Germany…
Tetrahedrite
Tetrahedrite is composed of two-component minerals: tetrahedrite, the end member rich in antimony, and tennantite, the end member rich in arsenic. It is a mineral…
Enargite
Enargite, mineral sulfosalt, copper arsenic sulfide (Cu3AsS4), which is sometimes a significant copper ore. Enargite is named in reference to its distinctive flawless cleavage, for…
Mesolite: Properties and Occurrences
Mesolite is a mineral of the zeolite family, similar to natrolite. It is a fragile member of the zeolite group and forms almost exclusively in delicate, needle-like crystal…
Merrillite: Properties and Occurrences
Merrillite is a calcium phosphate mineral with the chemical formula Ca9NaMg(PO4)7. It is a calcium phosphate mineral found in some meteorites. It is an anhydrous,…
Cassiterite – a Tin Oxide Mineral
Cassiterite is a reddish, brownish, or yellowish mineral consisting of tin dioxide. It is the most important source of tin, and most of the world’s…
Meridianiite: Properties and Occurrences
Meridianiite is the mineral consisting of magnesium sulfate undecahydrate, MgSO4•11H2O. These minerals can form by precipitation from a saturated solution or through evaporation of a brine solution at or below the…
Merenskyite: Properties and Occurrences
Merenskyite is a rare telluride / bismuthinide mineral with formula: (Pd, Pt)(Te, Bi)2. It is a trigonal-ditrigonal pyramidal white mineral containing bismuth, palladium, platinum, and…
Mereheadite: Properties and Occurrences
Mereheadite is a monoclinic-prismatic mineral containing chlorine, hydrogen, lead, and oxygen. It is a rare oxychloride that can be found with Mendipite at Merehead Quarry,…
Meneghinite: Properties and Occurrences
Meneghinite is a rare mineral that generally forms interesting acicular crystals. It is a sulfosalt mineral with the chemical formula CuPb13 Sb7S24. It is a mineral consisting…
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