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<n>Pyrite</n> from Navajún, Spain. Photo by <n>Carles Millan</n>.

<n>Orange Phantom Quartz</n> with <n>Kaolin</n> or <n>Calcite</n> inclusions.

Opal Rough, top quality, Red Fire Opal, Natural Opal Rough, Rainbow colors, Large Opal, Big Opal, Ethiopian Opal, Natural Crystal, 51.35 Cts

77Ct Rainbow ContraLuz Ethiopian Welo Rough Specimen Rough Opal

A <n>Quartz</n> crystal from Panasqueira, Portugal. Photo by <n>Rob Lavinsky</n> for <n>iRocks.com</n>.

New Hampshire's state gem, <n>Smoky quartz</n>. Photo by the <n>United States Department of Agriculture</n>, 1993.

<n>Plate 13: Copper Ores</n> from <n>Reinhard Brauns</n>'s 1903 book, <n>Das Mineralreich</n>.

A collection of <n>Natural Ethiopian Welo Fire Opal</n> cabochons.

UNTREATED 14.46Ct Dark Base Ethiopian Welo Rough Opal ~ RARE

<n>Green</n>, a digital artwork by <n>tamzly</n>.

The Mineral Gallery's Best Offer Auction #130

A <n>Quartz</n> crystal specimen from Arkansas, USA. Photo by <n>Rob Lavinsky</n>.

<n>Amethyst puntas</n>, which artist <n>Marina Abramović</n> equates with wisdom teeth in her conceptual work.