Ad
related to: blue violets meaning spiritual properties of green calcite mineral
Search results
Results from the WOW.Com Content Network
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 ...
Well known for its blue color, sodalite may also be grey, yellow, green, or pink and is often mottled with white veins or patches. The more uniformly blue material is used in jewellery, where it is fashioned into cabochons and beads. Lesser material is more often seen as facing or inlay in various applications.
The scapolites ( Greek: σκάπος, "rod", and λίθος, "stone") are a group of rock-forming silicate minerals composed of aluminium, calcium, and sodium silicate with chlorine, carbonate and sulfate. The two endmembers are meionite ( Ca4Al6Si6O24CO3) [ 2] and marialite ( Na4Al3Si9O24Cl ). [ 3][ 4] Silvialite (Ca,Na)4Al6Si6O24(SO4,CO3) is ...
The name apophyllite is derived from the Greek apophyllízo ( ἀποφυλλίζω ), meaning 'it flakes off', a reference to this class's tendency to flake apart when heated, due to water loss. Exfoliation of apophyllite is also possible by treating it with acids or simply by rubbing it. These minerals are typically found as secondary ...
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]
Tanzanite is the blue and violet variety of the mineral zoisite (a calcium aluminium hydroxyl sorosilicate), caused by small amounts of vanadium. [3] Tanzanite belongs to the epidote mineral group. Tanzanite is only found in Simanjiro District of Manyara Region in Tanzania , in a very small mining area approximately 7 km (4.3 mi) long and 2 km ...
Originating from the Persian word for the gem, lāžward, [ 1] lapis lazuli is a rock composed primarily of the minerals lazurite, pyrite and calcite. As early as the 7th millennium BC, lapis lazuli was mined in the Sar-i Sang mines, [ 2] in Shortugai, and in other mines in Badakhshan province in modern northeast Afghanistan. [ 3]
Lazurite is a product of contact metamorphism of limestone and is typically associated with calcite, pyrite, diopside, humite, forsterite, hauyne and muscovite. [ 2 ] Other blue minerals, such as the carbonate azurite and the phosphate lazulite , may be confused with lazurite, but are easily distinguished with careful examination.
Ad
related to: blue violets meaning spiritual properties of green calcite mineral