Fettelite: Properties and Occurrences
Fettelite, also known as sanguinite, is a mercury-sulfosalt mineral with the chemical formula Ag16HgAs4S15. It is a rare Silver Mercury Arsenic Sulfosalt forming silvery to…
Geographic Minerals
Orthorhombic Ferroselite
Orthorhombic ferroselite and its isometric polymorph dzharkenite are iron selenides of general formula FeSe2 precipitated under reducing conditions in anoxic environments. It is an orthorhombic-dipyramidal…
Post-perovskite (pPv)
Post-perovskite (pPv) is a high-pressure phase of magnesium silicate (MgSiO3). It is a high-pressure phase of several minerals, including magnesium silicate. It is composed of…
Ilmenite: Properties and Ooccurrences
Ilmenite is the titanium-iron oxide mineral with the idealized formula FeTiO3. It is a common accessory mineral in igneous rocks, sediments, and sedimentary rocks in many…
Ferronigerite-2N1S
Ferronigerite-2N1S is an iron, tin, alumino-hydroxide mineral that naturally occurs around sillimanite-quartz veins. It is very rarely found in gem-quality, cut-able material. Related to, and…
Ferro-actinolite
Ferro-actinolite is the ferrous iron-rich endmember of the actinolite-tremolite continuous solid solution series of the double chain calcareous amphibole group of inosilicate minerals. It is…
Ferrimolybdite: Properties and Occurrences
Ferrimolybdite is a hydrous iron molybdate mineral with formula: Fe23+(MoO4)3·8(H2O) or Fe23+(MoO4)3·n(H2O). It is an orthorhombic mineral containing hydrogen, iron, molybdenum, and oxygen. It occurs…
Ferrihydrite
Ferrihydrite (Fh) is a widespread hydrous ferric oxyhydroxide mineral at the Earth’s surface and a likely constituent in extraterrestrial materials. Ferrihydrite is a metastable mineral.…
Ferrierite: Properties and Occurrence
The ferrierite group of zeolite minerals (the FER structure) consists of three very similar species: ferrierite-Mg, ferrierite-Na, and ferrierite-K, based on the dominant cation in…
Feroxyhyte
Feroxyhyte is an oxide/hydroxide of iron, δ-Fe3+ O(OH). It is a hexagonal oxide/hydroxide of iron that occurs in manganese-iron nodules on the Pacific Ocean floor,…
Fergusonite: Properties and Occurrences
Fergusonite is a mineral comprising a complex oxide of various rare-earth elements. It is a dark mineral consisting of oxides of yttrium and erbium and…
Ferberite: Properties and Occurrences
Ferberite is the iron endmember of the manganese – iron wolframite solid solution series. The manganese endmember is hübnerite. It is a mineral consisting of…
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