عقیق احمر
Appearance
عقیق احمر | |
---|---|
![]() 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] |
حوالہ جات
[ترمیم]- ↑ Rudolf Duda and Lubos Rejl: Minerals of the World (Arch Cape Press, 1990)