Feldspars (silicates): Microcline
Diagnostic Card.
In the photo - a sample of microcline. Below: amazonite crystals (blue-green variety of microcline) of the State of Colorado.
K Al Si 3 O 8
Crystal system triclinic
Hardness 6
Specific weight 2,53-2,56
Cleavage is perfect
Fracture conchoidal, irregular, brittle
Colour light gray, yellow, light red
Color white powder
Gloss glass, mother of pearl
two groups stand out among feldspars: 1) potassium feldspar - sanidine, orthoclase, with its variety of adularia (Moonstone) and microcline (its green variety - Amazonia); 2) lime-sodium feldspars (called plagioclase).
Microcline is triclinic modification of potassium aluminosilicate, whose other members are the sanidine and orthoclase. Its crystals are light gray, gray, reddish and yellowish color, green, and very rarely, compared with orthoclase, have a simple habit.
Origin.
Microcline - a characteristic component of many rocks of granite and gneiss type.
Place of Birth.
In a distinct pink crystals of microcline, among many localities, found in Kata in Francese Maddalena. Classic symptoms of microcline are located in the United States and Russia, in the Urals.
Varieties.
Used in a variety of jewelry - Amazonia - has a green or azure-green color. It rarely occurs in the form of massive units, more often - in the form of well-formed crystals having a good appearance and is short-visible signs of cleavage planes. Coating is most likely due to the particular crystal lattice defect caused by the presence of lead contaminants.
Name received by the Amazon River. Sensitive to compressive forces. The most significant deposits in the United States (Colo.), The other in Brazil, India, Madagascar, Namibia, the CIS (the Urals, the Kola Peninsula, Baikal, Pamir). Flat grinding tables and cabochon. Reminiscent of jade, turquoise.
The main location located in Russia, North America, Brazil, India, Madagascar and Tanzania. Treated in cabochon or faceted ball for making necklaces.
Microcline. Medvedka South, North. Karelia, Russia. The height of the crystal ~ 30 cm Photo:. © AA Evseev.
- Gatchell - "New Almadén snag" - arsenide and antimony sulfide (modern sulphosalts)
- Antimony - toxic metal (semi-metal) are widely used in industry, medicine and engineering
- Zirconium - a rare and non- metal and dangerous jewel in the oxide and salts
- Gold - yellow dangerous and toxic metal -date and accurate digital cable technology
- Sulphur - a golden-yellow toxic substance and a sign of volcanic activity
- Cadmium - a toxic uncirculated unknown wide range of people silvery metal
- Lead - a poisonous gray simulator silver metal and toxic metal snag
- Arsenic - poison classic medieval and modern poisoners and medicine in medicine
Toxic and hazardous radioactive rocks and minerals
** - Poisonous stones and minerals (obligatory check in chemical laboratory + clear indication of toxicity)
** - Radioactive rocks and minerals (obligatory check on a regular dosimeter + ban on the open sale of radioactivity in the event of more than 24 mR / hour + additional measures to protect the population)
Catalog minerals and gems in groups of the world
** - Poisonous stones and minerals
** - Radioactive rocks and minerals
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