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A light, relatively hard yet fragile mineral, sodalite is named after its sodium content; in mineralogy it may be classed as a feldspathoid. Well known for its blue color, sodalite may also be grey, yellow, green, or pink and is often mottled with white veins or patches.
Blueschist ( / ˈbluːʃɪst / ), also called glaucophane schist, is a metavolcanic rock [ 1] that forms by the metamorphism of basalt and rocks with similar composition at high pressures and low temperatures (200–500 °C (392–932 °F)), approximately corresponding to a depth of 15–30 km (9.3–18.6 mi). The blue color of the rock comes ...
The name apophyllite refers to a specific group of phyllosilicates, a class of minerals. Originally, the group name referred to a specific mineral, [ 4] but was redefined in 1978 to stand for a class of minerals of similar chemical makeup that comprise a solid solution series, and includes the members fluorapophyllite- (K), fluorapophyllite ...
The diagnostic properties of calcite include a defining Mohs hardness of 3, a specific gravity of 2.71 and, in crystalline varieties, a vitreous luster. Color is white or none, though shades of gray, red, orange, yellow, green, blue, violet, brown, or even black can occur when the mineral is charged with impurities. [4]
Viola sororia ( / vaɪˈoʊlə səˈrɔːriə / vy-OH-lə sə-ROR-ee-ə ), [ 5] known commonly as the common blue violet, is a short-stemmed herbaceous perennial plant native to eastern North America. It is known by a number of common names, including common meadow violet, purple violet, woolly blue violet, hooded violet, and wood violet.
Prehnite is an inosilicate of calcium and aluminium with the formula: Ca 2 Al(AlSi 3 O 10)(OH) 2 with limited Fe 3+ substitutes for aluminium in the structure. [7] Prehnite crystallizes in the orthorhombic crystal system, [7] and most often forms as stalactitic, botryoidal, reniform or globular aggregates, [8] with only just the crests of small crystals showing any faces, which are almost ...
Calcite rhombohedral crystal structure. Iceland spar is a colourless, transparent variety of calcium carbonate (CaCO 3 ). [ 3] It crystallizes in the trigonal system, typically forming rhombohedral crystals. [ 4] It has a Mohs hardness of 3 and exhibits double refraction, splitting a ray of light into two rays that travel at different speeds ...
Apatite is a group of phosphate minerals, usually hydroxyapatite, fluorapatite and chlorapatite, with high concentrations of OH −, F − and Cl − ion, respectively, in the crystal. The formula of the admixture of the three most common endmembers is written as Ca 10 ( PO 4) 6 (OH,F,Cl) 2, and the crystal unit cell formulae of the individual ...
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