Hollandite: Properties and Occurrences
Hollandite (chemical formula: [Ba(Mn64+Mn23+)O16] is an oxide mineral. It is the barium-manganese (III) endmember of the coronadite group. It is a monoclinic-prismatic white mineral containing…
Geographic Minerals
Hoelite: Properties and Occurrences
Hoelite is a very rare organic mineral discovered in 1922 at Mt. Pyramide, Spitsbergen, Norway. Its chemical formula is C14H8O2 (9,10-anthraquinone). It is a monoclinic-prismatic…
Hodgkinsonite: Properties and Occurrences
Hodgkinsonite is a rare zinc manganese silicate mineral Zn2MnSiO4(OH)2. It is a rare monoclinic zinc manganese silicate mineral, having a pink, red, or yellow-red color.…
Hisingerite
Hisingerite is an iron(III) phyllosilicate mineral with formula Fe23+ Si2O5(OH)4·2H2O. It is a mineral perhaps consisting of a black amorphous iron ore that is a…
Hilgardite: Properties and Occurrences
Hilgardite is a borate mineral with the chemical formula Ca2B5O9Cl·H2O. It is a vitreous mixed borate and chloride mineral calcium. It was named for geologist…
Hidalgoite: Properties and Occurrences
Hidalgoite, PbAl3(AsO4)(SO4)(OH)4, is a rare member of the beudantite group and is usually classified as part of the alunite family. It is a trigonal-hexagonal scalenohedral…
Hibonite: Properties and Occurrences
Hibonite [(Ca, Ce)(Al, Ti, Mg)12O19] is a very rare gem. It is a calcium aluminate mineral found in carbonaceous chondrite meteorites. Stones which are large…
Hiärneite
Hiärneite is an oxide mineral named after the Swedish geologist Urban Hiärne (1641-1727). It is an oxide mineral containing antimony and zirconium. The mineral can…
Hexaferrum
Hexaferrum is a (formula: Fe, Os, Ru, Ir) hexagonal-dihexagonal dipyramidal yellowish steel-gray mineral containing iridium, iron, osmium, and ruthenium. It was named for the crystal…
Heulandite: Properties and Occurrences
Heulandite is the name of a series of tecto-silicate minerals of the zeolite group. This mineral is a zeolite consisting of a hydrous aluminosilicate of…
Hessite: Properties and Occurrences
Hessite is a mineral form of disilver telluride (Ag2Te). It is a mineral consisting of a lead-gray sectile silver telluride often auriferous and usually massive.…
Hermannjahnite
Hermannjahnite is a rare sulfate mineral with the relatively simple formula CuZn(SO4)2. It is one of many fumarolic minerals discovered on the Tolbachik volcano. The…
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