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Gormanite is a phosphate mineral with the formula (Fe,Mg) 3 Al 4 (PO 4) 4 (OH) 6 ·2H 2 O. It was named after the University of Toronto professor Donald Herbert Gorman (1922–2020). Occurrence
These minerals are found in high-grade metamorphic banded iron formation and form a compositional series between Mn 2 Mg 5 Si 8 O 22 (OH) 2 (tirodite) and Mn 2 Fe 5 Si 8 O 22 (OH) 2 (dannemorite). Calcium, sodium and potassium concentrations in cummingtonite are low. Cummingtonite tends toward more calcium substitution than related anthophyllite.
Gaspéite presence in the geologic environment may be used as an ore mining indicator of nickel rich minerals nearby. Gaspéite stones are used for carving ornamental objects and animal figurines, and are also cut and polished into attractive apple green color (often veined) cabochons for jewelry use. [citation needed]
Titanomagnetite is a mineral containing oxides of titanium and iron, with the formula Fe 2+ (Fe 3+,Ti) 2 O 4. It is also known as titaniferous magnetite, mogensenite, Ti-magnetite, or titanian magnetite. [1] It is part of the spinel group of minerals. The Curie temperature for titanomagnetite has been found to have a wide range of 200 to 580°C ...
Any one mineral may be dominant, and this, together with the two or three other major minerals present, suffices to determine the petrographic name. The presence of the following minerals precludes a rock from being classified as a lamproite: primary plagioclase , melilite , monticellite , kalsilite , nepheline , Na-rich alkali feldspar ...
The mineral forms prismatic needle-like crystals ("needle ironstone" [3]) but is more typically massive. [2] Feroxyhyte and lepidocrocite are both polymorphs of the iron oxyhydroxide FeO(OH) which are stable at the pressure and temperature conditions of the Earth's surface. Although they have the same chemical formula as goethite, their ...
Colemanite is a secondary mineral that forms by alteration of borax and ulexite. [ 3 ] It was first described in 1884 for an occurrence near Furnace Creek in Death Valley and was named after William Tell Coleman (1824–1893), owner of the mine "Harmony Borax Works" where it was first found. [ 4 ]
Majorite is believed to be an abundant mineral in the lower transition zone and uppermost lower mantle of the Earth at depths of 550–900 km (340–560 mi). It forms complex solid solutions with other Al, Fe, and Ca-bearing garnets in this region. All of the minerals of the Earth's mantle are made of oxygen as the principal anion.