SettingsTrigonal minerals
Akimotoite
Akimotoite is a rare silicate mineral in the ilmenite group of minerals.
Akimotoite is a rare silicate mineral in the ilmenite group of minerals.
Aktashite
Aktashite is a rare arsenic sulfosalt mineral with formula Cu6Hg3As4S12.
Aktashite is a rare arsenic sulfosalt mineral with formula Cu6Hg3As4S12.
Alarsite
Alarsite is an aluminium arsenate mineral Its name is derived from its composition of aluminium and arsenic.
Alarsite is an aluminium arsenate mineral Its name is derived from its composition of aluminium and arsenic.
Alunite
Alunite is a sulfate mineral that was first observed in the 15th century in Monti della Tolfa, north of Rome, where it was mined for the manufacture of alum.
Alunite is a sulfate mineral that was first observed in the 15th century in Monti della Tolfa, north of Rome, where it was mined for the manufacture of alum.
Ankerite
Ankerite is a calcium, iron, magnesium, manganese carbonate mineral of the group of rhombohedral carbonates with formula: Ca(Fe, Mg, Mn)(CO3)2.
Ankerite is a calcium, iron, magnesium, manganese carbonate mineral of the group of rhombohedral carbonates with formula: Ca(Fe, Mg, Mn)(CO3)2.
Aphthitalite
Aphthitalite is a potassium sulfate mineral with the chemical formula: (K,Na)3Na(SO4)2.
Aphthitalite is a potassium sulfate mineral with the chemical formula: (K,Na)3Na(SO4)2.
Arsenic
Arsenic is a chemical element with the symbol As, atomic number 33 and relative atomic mass 74.92.
Arsenic is a chemical element with the symbol As, atomic number 33 and relative atomic mass 74.92.
Bararite
Bararite is a natural form of ammonium fluorosilicate (also known as hexafluorosilicate or fluosilicate).
Bararite is a natural form of ammonium fluorosilicate (also known as hexafluorosilicate or fluosilicate).
Beudantite
Beudandite is a secondary mineral occurring in the oxidized zones of polymetallic deposits.
Beudandite is a secondary mineral occurring in the oxidized zones of polymetallic deposits.
Carnelian
Carnelian (also spelled cornelian) is a brownish-red mineral which is commonly used as a semi-precious gemstone.
Carnelian (also spelled cornelian) is a brownish-red mineral which is commonly used as a semi-precious gemstone.
Chabazite
Chabazite is a tectosilicate mineral of the zeolite group, closely related to gmelinite, with formula (Ca,Na2,K2,Mg)Al2Si4O12·6H2O. Recognized varieties include Chabazit...
Chabazite is a tectosilicate mineral of the zeolite group, closely related to gmelinite, with formula (Ca,Na2,K2,Mg)Al2Si4O12·6H2O. Recognized varieties include Chabazit...
Chabazite-Ca
Chabazite is a tectosilicate mineral of the zeolite group, closely related to gmelinite, with formula (Ca,Na2,K2,Mg)Al2Si4O12·6H2O. Recognized varieties include Chabazit...
Chabazite is a tectosilicate mineral of the zeolite group, closely related to gmelinite, with formula (Ca,Na2,K2,Mg)Al2Si4O12·6H2O. Recognized varieties include Chabazit...
Chalcedony
Chalcedony is a cryptocrystalline form of silica, composed of very fine intergrowths of the minerals quartz and moganite.
Chalcedony is a cryptocrystalline form of silica, composed of very fine intergrowths of the minerals quartz and moganite.
Chalcophyllite
Chalcophyllite is a rare secondary copper arsenate mineral occurring in the oxidized zones of some arsenic-bearing copper deposits.
Chalcophyllite is a rare secondary copper arsenate mineral occurring in the oxidized zones of some arsenic-bearing copper deposits.
Chrome chalcedony
Chrome chalcedony is an green variety of the mineral chalcedony, colored by small quantities of chromium.
Chrome chalcedony is an green variety of the mineral chalcedony, colored by small quantities of chromium.
Corundum
Corundum is a crystalline form of aluminium oxide with traces of iron, titanium and chromium.
Corundum is a crystalline form of aluminium oxide with traces of iron, titanium and chromium.
Fluor-liddicoatite
Fluor-liddicoatite is a rare member of the tourmaline group of minerals, elbaite subgroup, and the theoretical calcium endmember of the elbaite-liddicoatite series; the pure end-member has not ...
Fluor-liddicoatite is a rare member of the tourmaline group of minerals, elbaite subgroup, and the theoretical calcium endmember of the elbaite-liddicoatite series; the pure end-member has not ...
Geerite
Geerite is a copper sulfide mineral with the chemical formula Cu8S5.
Geerite is a copper sulfide mineral with the chemical formula Cu8S5.
Geikielite
Geikielite is a magnesium titanium oxide mineral with formula: MgTiO3.
Geikielite is a magnesium titanium oxide mineral with formula: MgTiO3.
Hematite
Hematite, also spelled as haematite, is the mineral form of iron oxide, one of several iron oxides.
Hematite, also spelled as haematite, is the mineral form of iron oxide, one of several iron oxides.
Huntite
Huntite is a carbonate mineral with the chemical formula Mg3Ca(CO3)4.
Huntite is a carbonate mineral with the chemical formula Mg3Ca(CO3)4.
Iceland spar
Iceland spar, formerly known as Iceland crystal, is a transparent variety of calcite, or crystallized calcium carbonate, originally brought from Iceland, and used in demonstrating the pola...
Iceland spar, formerly known as Iceland crystal, is a transparent variety of calcite, or crystallized calcium carbonate, originally brought from Iceland, and used in demonstrating the pola...
Ilmenite
Ilmenite is a weakly magnetic titanium-iron oxide mineral which is iron-black or steel-gray.
Ilmenite is a weakly magnetic titanium-iron oxide mineral which is iron-black or steel-gray.
Liddicoatite
Liddicoatite is a rare member of the tourmaline group of minerals, elbaite subgroup, and the theoretical calcium endmember of the elbaite-liddicoatite series; the pure end-member has not yet be...
Liddicoatite is a rare member of the tourmaline group of minerals, elbaite subgroup, and the theoretical calcium endmember of the elbaite-liddicoatite series; the pure end-member has not yet be...
Loveringite
Loveringite is a rare metallic oxide mineral of the crichtonite group with the chemical formula (Ca,Ce)(Ti,Fe,Cr,Mg)21O38.
Loveringite is a rare metallic oxide mineral of the crichtonite group with the chemical formula (Ca,Ce)(Ti,Fe,Cr,Mg)21O38.
Millerite
Millerite is a nickel sulfide mineral, NiS. It is brassy in colour and has an acicular habit, often forming radiating masses and furry aggregates.
Millerite is a nickel sulfide mineral, NiS. It is brassy in colour and has an acicular habit, often forming radiating masses and furry aggregates.
Phenakite
Phenacite or phenakite is a fairly rare nesosilicate mineral consisting of beryllium orthosilicate, Be2SiO4.
Phenacite or phenakite is a fairly rare nesosilicate mineral consisting of beryllium orthosilicate, Be2SiO4.
Plumbogummite
Plumbogummite is a rare secondary lead phosphate mineral, belonging to the alunite supergroup of minerals, crandallite subgroup.
Plumbogummite is a rare secondary lead phosphate mineral, belonging to the alunite supergroup of minerals, crandallite subgroup.
Povondraite
Povondraite is a mineral from the tourmaline group.
Povondraite is a mineral from the tourmaline group.
Ruby
A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide).
A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide).
Sapphire
Sapphire is a gemstone variety of the mineral corundum, an aluminium oxide.
Sapphire is a gemstone variety of the mineral corundum, an aluminium oxide.
Shandite
Shandite is a sulfide mineral with chemical formula: Ni3Pb2S2.
Shandite is a sulfide mineral with chemical formula: Ni3Pb2S2.
Shigaite
Shigaite is a mineral with formula NaAl3(Mn2+)6(SO4)2(OH)18·12H2O that typically occurs as small, hexagonal crystals or thin coatings.
Shigaite is a mineral with formula NaAl3(Mn2+)6(SO4)2(OH)18·12H2O that typically occurs as small, hexagonal crystals or thin coatings.
Susannite
Susannite is a lead sulfate carbonate hydroxide mineral, a rare dimorph of Leadhillite.
Susannite is a lead sulfate carbonate hydroxide mineral, a rare dimorph of Leadhillite.
Tourmaline
Tourmaline is a crystal boron silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium.
Tourmaline is a crystal boron silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium.
Yogo sapphire
Yogo sapphires are a variety of corundum found only in Yogo Gulch, located in central Montana in the Little Belt Mountains in Judith Basin County, Montana on land once inhabited by the Piegan Bl...
Yogo sapphires are a variety of corundum found only in Yogo Gulch, located in central Montana in the Little Belt Mountains in Judith Basin County, Montana on land once inhabited by the Piegan Bl...