Gemmology
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Quartz — specimens [gallery view]


Quartz is the most common mineral found on the surface of the Earth. In hydrothermal veins, epithermal to alpine; characteristic of granites and granite pegmatites; in sandstones and quartzites, less abundant in other rock types; in hydrothermal metal deposits. Common in carbonate rocks; a residual mineral in soils and sediments (Anthony et al., 2001—2005). There are faceted specimens of 7000 carats (Arem, 1987: 159).
Amethyst — specimen 0675
0675
no precise locality
Amethyst — specimen 0676
0676
no precise locality
Amethyst — specimen 0678
0678
no precise locality
Amethyst — specimen 0679
0679
no precise locality
Amethyst — specimen 0681
0681
no precise locality
Amethyst — specimen 0703
0703
no precise locality
Amethyst — specimen 0706
0706
no precise locality
Amethyst — specimen 0467
0467
no precise locality
Amethyst — specimen 0753
0753
Brazil
Amethyst — specimen 0085
0085
Uruguay

Quartz — specimens — 229
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