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Cacoxenite is an iron aluminium phosphate mineral [5] with formula: Fe 3+ 24 Al(PO 4) 17 O 6 (OH) 12 ·17(H 2 O). [4] Cacoxenite is associated with iron ores. [6] The name comes from the Greek κăκός for "bad" or "evil" and ξένος for "guest" because the phosphorus content of cacoxenite lessens the quality of iron smelted from ore containing it.
Phosphosiderite is often found in a bright orchid-purple tint with yellow-colored streaks. The vein-like streaks found in the stone are known as cacoxenite. Four other rare color variants are rose red, brown-reddish yellow, mossy green, and dark shades of purple. Phosphosiderite can also be found as a colorless mineral. [6]
In metamorphic rocks, coesite is now recognized as one of the best mineral indicators of metamorphism at very high pressures (UHP, or ultrahigh-pressure metamorphism). [8] Such UHP metamorphic rocks record subduction or continental collisions in which crustal rocks are carried to depths of 70 km (43 mi) or more. Coesite is formed at pressures ...
Calcium oxide is also a separate mineral species (with the unit formula CaO), named 'Lime'. [30] [31] It has an isometric crystal system, and can form a solid solution series with monteponite. The crystal is brittle, pyrometamorphic, and is unstable in moist air, quickly turning into portlandite (Ca(OH) 2). [32]
Fluellite is a mineral with the chemical formula Al 2 (PO 4)F 2 (OH)•7H 2 O. The name is from its chemical composition, being a fluate of alumine (French). [4]It was first described in 1824 for an occurrence in the Stenna Gwyn Mine, St Stephen-in-Brannel, St Austell District, Cornwall, England.
Calcium oxalate crystals are commonly found in lichens, where they occur in two mineral forms: weddellite (CaC 2 O 4 ·(2+x)H 2 O) and whewellite (CaC 2 O 4 ·H 2 O). These crystals can form both on the surface of the lichen as a powdery coating called pruina and within the internal structures of the lichen thallus. The type and distribution of ...
Goethite (/ ˈ ɡ ɜːr t aɪ t /, [6] [7] US also / ˈ ɡ oʊ θ aɪ t / [8] [9]) is a mineral of the diaspore group, consisting of iron(III) oxide-hydroxide, specifically the α-polymorph. It is found in soil and other low-temperature environments such as sediment.
The axinite group minerals are found in medium-to-low contact metamorphism, regional or metasomatic environments, in boron-containing environments. Axinite-(Mg) appears more frequently in areas of contact metamorphism. It is a relatively rare mineral, known in about a dozen locations in the world.
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