Science

Hematite, also spelled as haematite, is the mineral form of iron(III) oxide (Fe2O3), one of several iron oxides. It is a reddish-black mineral consisting of…

Hellyerite, NiCO3·6(H2O), is a hydrated nickel carbonate mineral. It is a monoclinic-prismatic light blue mineral containing carbon, hydrogen, nickel, and oxygen. Hellyerite is observed forming…

Hedenbergite, CaFeSi2O6, is the iron rich end member of the pyroxene group having a monoclinic crystal system. It is a rock-forming mineral in several metamorphic…

Hectorite is a rare soft, greasy, white clay mineral with a chemical formula of Na0.3(Mg, Li)3 Si4O10(OH)2. It is a basic silicate of magnesium and…

Heazlewoodite, Ni3S2, is a rare sulfur-poor nickel sulfide mineral found in serpentinized dunite. It is a rare nickel sulfide mineral found in serpentinized dunite. It…

Hazenite is a hydrous phosphate mineral with the chemical formula of KNaMg2(PO4)2·14H2O, therefore a hydrous alkali magnesium phosphate. It is a member of the struvite…

Haxonite is an iron-nickel carbide mineral found in iron meteorites and carbonaceous chondrites. It has a chemical formula of (Fe, Ni)23C6, crystallizes in the cubic…

Hawleyite is a rare sulfide mineral in the sphalerite group, dimorphous and easily confused with greenockite. It was discovered in 1955 in the Hector-Calumet mine,…

Hauyne, is a tectosilicate mineral with sulfate, with endmember formula Na3Ca(Si3Al3)O12(SO4). It is a mineral usually occurring in rounded crystalline grains, rarely in distinct isometric…

Hausmannite is a complex oxide of manganese-containing both di- and tri-valent manganese. The formula can be represented as Mn2+ Mn3+2O4. It is an opaque mineral…

Hauerite is a manganese sulfide mineral with the chemical formula MnS2. It is a mineral consisting of native manganese sulfide and occurring as reddish brown…

Harmotome is a mineral, one of the rarer zeolites; a hydrated barium silicate with the formula: (Ba0.5,Ca0.5,Na,K)5Al5,Si11O32·12(H2O). It is a rare zeolite, a hydrated barium…