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Well Polished Carnelian Stone 23 to 73 gram Medium size pieces 170 gram Lot
Well polished Natural Carnelian Stone (medium size pieces) - 0.17 Kg Lot (0.37 pound)
Weight per piece: 23 to 73 gram
Sizes: 28x25x24 mm to 48x39x29 mm (1.1x1.0x0.9 inch to 1.9x1.5x1.2 inch)
Quantity: about 3 to 5 pieces in each lot
These stones are from Brazil.
The pictures in the listing are just for reference as we are selling multiple pieces with same pictures.
*** Carnelian Category Chalcedony variety Chemical formula Silica (silicon dioxide, SiO2) Molar mass 60 g / mol Color Brownish-red 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 Carnelian, also called cornelian, a translucent, brownish-red, semiprecious variety of the silica mineral chalcedony that owes its red to reddish brown colour to colloidally dispersed hematite (iron oxide). It is a close relative of sard, differing only in the shade of red. Carnelian was highly valued and used in rings and signets by the Greeks and Romans, some of whose intaglios have retained their high polish better than many harder stones. Carnelian’s colour is enhanced by baking and dyeing with iron salts. Chief localities are Ratnapura, India; Campo de Maia, Braz.; and Warwick, Queens., Austl. Its physical properties are those of quartz. Stones may be uniformly colored or faintly banded. The best carnelian is from India, where it is placed in the sun to change from brown to tints to red. Most carnelian on the market is stained chalcedony from Brazil or Uruguay.
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