Hydroxylapatite
Hydroxylapatite, also called hydroxyapatite (HA), is a naturally occurring mineral form of calcium apatite with the formula Ca5(PO4)3(OH) but is usually written Ca10(PO4)6(OH)2 to denote…
Geographic Minerals
Hydrotalcite: Properties and Occurrences
Hydrotalcite is a layered double hydroxide of general formula Mg6Al2CO3(OH)16·4(H2O), whose name is derived from its resemblance with talc and its high water content. It…
Hydrohalite
Hydrohalite is a mineral that occurs in saturated halite brines at cold temperatures (−5 °C). It was first described in 1847 in Salzburg, Austria. It…
Hydromagnesite: Properties and Occurrences
Hydromagnesite is a hydrated magnesium carbonate mineral with the formula Mg5(CO3)4(OH)2·4H2O. It is a mineral consisting of a basic magnesium carbonate occurring in the form…
Hydrogrossular
Hydrogrossular is a calcium aluminium garnet series (formula: Ca3Al2(SiO4)3-x(OH)4x, with hydroxide (OH) partially replacing silica (SiO4)). The endmembers of the hydrogarnet family (grossular, hibschite, and…
Hydroboracite
Hydroboracite is a hydrated borate mineral (hence the name) of calcium and magnesium, whose chemical composition is CaMgB6O8(OH)6·3H2O. It is a minor borate ore mineral.…
Huttonite: Properties and Occurrences
Huttonite is a thorium nesosilicate mineral with the chemical formula ThSiO4 and which crystallizes in the monoclinic system. It is a mineral consisting of the…
Hutchinsonite
Hutchinsonite is a sulfosalt mineral of thallium, arsenic and lead with formula (Tl, Pb)2As5S9. It is a rare hydrothermal mineral, a rare sulfosalt mineral of…
Hureaulite
Hureaulite is a manganese phosphate with the formula Mn52+(PO3OH)2(PO4)2·4H2O. It is a manganese phosphate mineral occurring in granite pegmatites. It is a mineral consisting of…
Huntite: Properties and Occurrences
Huntite is a carbonate mineral with the chemical formula Mg3Ca(CO3)4. It is a trigonal-trapezohedral mineral containing calcium, carbon, magnesium, and oxygen. It was named in…
Humite: Properties and Occurrences
Humite is a mineral found in the volcanically ejected masses of Vesuvius. It is a fairly rare mineral. It was first described in 1813 and…
Huemulite: Properties and Occurrences
Huemulite is a mineral with formula Na4Mg(V10O28)·24H2O that is yellow to orange in color. It is a triclinic-pinacoidal mineral containing hydrogen, magnesium, oxygen, sodium, and…
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