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or manganese
especially the liver
05 Dana classification: 75
This unique specimen is formed when second generation crystals form over the original larger crystals
At surface temperatures and pressures
Labradorite Tumbled Stones - Medium 20 - 30 mm - 1 LB - Madagascar Bags or manganeseLABRADORITE Labradorite ((Ca,Na)(Al,Si)4O8), a feldspar mineral, is an intermediate to calcic member of the plagioclase series. It has an anorthite percentage (%An) of between 50 and 70. The specific gravity ranges from 2. 71 to 2. 74. The streak is white, like most silicates. The refractive index ranges from 1. 555 to 1. 575. Twinning is common. As with all plagioclase members the crystal system is triclinic and three directions of cleavage are
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