عقیق احمر

آزاد دائرۃ المعارف، ویکیپیڈیا سے
:چھلانگ بطرف رہنمائی، تلاش
Carnelian / Sard
Polished carnelian/sard pebbles. Scale is in millimeters.
General
Category Chalcedony variety
Chemical formula Silica (silicon dioxide, SiO2)
Identification
Molar mass 60 g / mol
Color Reddish-brown
Crystal system Trigonal
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]

  1. ^ Rudolf Duda and Lubos Rejl: Minerals of the World (Arch Cape Press, 1990)