عقیق احمر
Carnelian sard (mineral specimen).jpg
Polished carnelian/sard pebbles. Scale is in millimeters.
General
CategoryChalcedony variety
Formula
(repeating unit)
Silica (silicon dioxide, SiO2)
Crystal systemTrigonal
Identification
Formula mass60 g / mol
ColorReddish-brown
CleavageAbsent
FractureUneven, splintery, conchoidal
Mohs scale hardness6 - 7
LusterVitreous, dull, greasy, silky
StreakWhite
DiaphaneityTranslucent
Specific gravity2.59 - 2.61
References[1]

حوالہ جاتترميم

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