Angel aura lemuric ice crystal from Arkansas USA (new in 2021)

Angel aura lemuric ice crystal from Arkansas USA (new in 2021)

Tourmaline -sometimes with mica crystallizations on it-

Tourmaline -sometimes with mica crystallizations on it- "with standing surface" found in Brazil.

Kyanite "with standing surface" Found in the far north of Brazil.

Nice little affordable Kyanite pieces with flat side, so it can stand up easily!
Availability: In stock
SKU
10778
  • Buy 10 for €23.00 each and save 21%
Kyanite "with standing surface" Found in the far north of Brazil. is available to buy in increments of 3

The mineral kyanite or disthene is an aluminum silicate with the chemical formula Al2SiO5. It belongs to the group of nesosilicates. The blue, gray, white, green or black mineral has a perfect cleavage according to the crystal plane [100], a white stripe color and a glass to pearl luster. The crystal system is triklin, the mean density is 3.61 and the hardness is 4 to 7. Kyanite is neither magnetic nor radioactive. The name of the mineral kyanite is derived from the Greek word kyanos, which means "blue". Kyanite is a very common mineral found in many rocks. It occurs in metamorphosed sedimentary rocks, among other things. It is also, along with the other aluminum silicates sillimanite and andalusite, an indicative mineral of the depth and temperature at which a rock has undergone metamorphosis. Kyanite is usually stable at temperatures below 650 ° Celsius and at pressures above 0.3 GPa (gigaPascal). The pressure and temperature are related, so that at high pressure (0.6 GPa) a higher temperature (600 ° C) is required to form sillimanite from kyanite. At pressures below 0.3 GPa it is precisely andalusite that is the stable aluminum silicate. Gem-quality Kyanites are found in India, in the gemstone deposits in Myanmar and Korea. In the United States, Kyanites are mined in California, Tennessee, Georgia, New Hampshire, and North Carolina. In Africa, kyanite is found in Kenya, Tanzania, in Europe in Russia, Switzerland, Austria and France. Kyanite occurs in the sand fraction of Dutch Quaternary river sediments. In the heavy mineral analysis as it took place in the Netherlands at the National Geological Survey during the second half of the twentieth century, the mineral is classified in the so-called stable group. Only the name distheen is used in this study.

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Dimensions 05-3kg
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