Feldspars (silicates): Anor (Anorthite)
Diagnostic Card.
Ca Al 3 Si 2 O 8
Crystal system triclinic
Hardness 6
Specific gravity 2.7
Cleavage is very easily seen
fracture brittle
Color from white to gray
Color white powder
Gloss glass
It forms a prismatic crystals or plate shape, sometimes mass with cleavage. Coloration varies from white to gray, sometimes pinkish. Gloss glass.
Diagnostic features.
Soluble in hydrochloric acid.
Origin.
It occurs as a component of basic volcanic and plutonic, but also metamorphic rocks; moreover, found in meteorites.
Place of Birth.
Beautiful Clear Crystals with gorgeous faces are found in cavities of lime Vesuvius volcanic products. Anofriev light gray, sometimes pinkish, was observed in metamorphosed limestones Monti Monzoni Val di Fassa (province of Trentino), in rocks Tsiklopovyh Islands (Sicily). Other classic location - Miyahe in Iceland and Franklin in New Jersey (USA).
Anorthite. Ilyinsky volcano, Kamchatka, Russia. Crystals to 1 cm Photo:. © AA Evseev.
Anorthite (crystal ~ 2 cm) in the rock. Java, on., Indonesia. Photo: © AA Evseev.
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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)
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** - Poisonous stones and minerals
** - Radioactive rocks and minerals
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