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Kyanite is a typically blue aluminosilicate mineral, found in aluminium -rich metamorphic pegmatites and sedimentary rock. It is the high pressure polymorph of andalusite and sillimanite, and the presence of kyanite in metamorphic rocks generally indicates metamorphism deep in the Earth's crust. Kyanite is also known as disthene or cyanite.
Aquamarine variety of beryl with tourmaline on orthoclase. Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico. Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals. Austinite from the Ojuela Mine, Mapimí, Durango, Mexico. Ametrine containing amethyst and citrine, from Bolivia.
The band was formed in January 1993, by bassist and vocalist Dejan Gvozden and guitarist Željko Markuš, who, having performed blues and rock standards in Belgrade cafes, were joined by drummer Dejan Kostić. By the time the band had written their first hit song "Dva metra" ("Two Meters"), for which the music video was directed by Milutin ...
These boron impurities change the diamond's color to slightly blue. Likewise, the only difference between ruby and sapphire is the type of impurities present in a corundum crystal. Twinned pyrite crystal group. In semiconductors, a special type of impurity, called a dopant, drastically changes the crystal's electrical properties.
Glaucophane is the magnesium -rich endmember and ferroglaucophane is the iron -rich endmember. Ferroglaucophane is similar to glaucophane but is slightly denser and hence increased specific gravity. The two endmembers are indistinguishable in hand specimens and are strongly pleochroic. Glaucophane's hardness is 5–6 and its specific gravity is ...
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Celestine (mineral) Celestine (the IMA -accepted name) [6] or celestite [1] [7] [a] is a mineral consisting of strontium sulfate ( Sr S O 4 ). The mineral is named for its occasional delicate blue color. Celestine and the carbonate mineral strontianite are the principal sources of the element strontium, commonly used in fireworks and in various ...
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