Science

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 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…

Induction Proof – Problems with Solutions Mathematical induction is a technique for proving a statement – a theorem, or a formula — that is asserted…

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 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 (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.…

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 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 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 is the iron endmember of the manganese – iron wolframite solid solution series. The manganese endmember is hübnerite. It is a mineral consisting of…

Felsőbányaite or basaluminite is a hydrated aluminum sulfate mineral with formula: Al4(SO4)(OH)10·4H2O. It is a rare white to pale yellow mineral which typically occurs as…

The feldspathoids are a group of tectosilicate minerals which resemble feldspars but have a different structure and much lower silica content. The feldspathoid group minerals…