عقیق احمر
From Wikipedia, the free encyclopedia
From Wikipedia, the free encyclopedia
عقیق احمر | |
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![]() Polished carnelian/sard pebbles. Scale is in millimeters. | |
General | |
Category | Chalcedony variety |
Formula (repeating unit) | Silica (silicon dioxide, SiO2) |
Crystal system | Trigonal |
Identification | |
Formula mass | 60 g / mol |
Color | Reddish-brown |
Cleavage | Absent |
Fracture | Uneven, splintery, conchoidal |
Mohs scale hardness | 6 - 7 |
Luster | Vitreous, dull, greasy, silky |
Streak | White |
Diaphaneity | Translucent |
Specific gravity | 2.59 - 2.61 |
References | [1] |
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