Pink tourmaline crystals growing on mica
Rubellite Tourmaline in Lepidolite Mica
Crystals of green toumaline and pink lepidolite
Rubellite I
Rubellite II
Tourmaline pegmatite
Tourmaline Pegmatite
Green Tourmaline in Muscovite, Maine
Rubellite tourmaline pendant
Bi-coloured tourmaline crystals
Verdite green tourmaline gemstone
Tourmaline mica in slate
Black tourmaline in mica schist
Tourmaline gemstone
Tourmaline crystals
Tourmaline gem
Tourmaline crystals in quartz
Tourmaline crystals in matrix
Tourmaline crystals on Albite
Blue tourmaline crystals
Tourmaline crystals in quartzite
Tourmaline gem, 365 carat
Tourmaline mineral, light micrograph
Tourmaline Crystals, Minas Gerais, Brazil
Quartz and green tourmaline crystals
Tourmaline
Graphic tourmaline, light micrograph
Schorl and quartz crystals in groundmass
Tourmaline specimen
Watermelon tourmaline
Tourmaline crystal
Tourmaline gemstones
Tourmaline quartz
Granite specimen
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline in quartz
Elbaite crystal, variety Tourmaline
Albite with Tourmaline
Tourmaline gemstones in quartz
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Schorl tourmaline crystal stone
Tourmaline in gneiss rock
Elbaite mineral (tourmaline)
Schorl variety of Tourmaline, Namibia
Two-mica granite
Schorl, the black variety of Tourmaline
Tourmaline crystal, thin section
Black tourmaline, SEM
Tourmaline crystal specimen
Tourmaline crystal specimens
Tourmaline embedded in feldspar rock
Hawk's Eye quartz stone
Elbaite mineral
Dravite mineral
Elbaite on albite and quartz
Granitic pegmatite
Rough pinkish-red Rubellite
紅電気石
Aggregate of muscovite crystals
Mica inclusion
Yellow-green Tourmaline rough
Mylonite, light micrograph
Lepidolite Crystal Gemstone
Granite
Opal gemstones
Blue opal gemstones
Single piece of blue opal
Opal mineral stone
Opal rock
Black opal gemstone
Garnet mica schist thin cut, polarised light micrograph
Aquamarine crystals
Cut Watermelon Tourmaline gemstone
Trillion cut tourmaline gemstone
Muscovite Mica
Cut green Paraiba Tourmaline gemstone
Tourmaline in pegmatite host rock
Tourmaline schorl specimen
Muscovite Mica, Ontario, Canada
Muscovite Star Mica
Ancient Roman columns
Mica schist folds, light micrograph
Opal specimen
Opalised fossil
Emeralds
Luxulyanite, thin section, LM
Polarized light experiments, 1847
Orthogneiss, light micrograph
Obsidian mineral stone
Mica in quartz, light micrograph
Opal gemstone
Biotite
Biotite, Tyringham, Massachusetts, USA
Opal specimens
Lepidolite, Newry, Maine, USA
Lepidolite in pegmatitic groundmass
Tourmaline on quartz
Opal
Opal gem necklace
Opal in its host rock
Boulder opal formation
Opal gem and rock
Opal specimen and cut stone
Fire opal
Opal surface
Opal on bedrock
Ironstone matrix with potch opal
Potch opal with smooth and rough surface
Fire Opal
Quartz Diorite, LM of thin section
Tourmaline cross section
Cut green Tourmaline gemstone
Quartz vein in schist
Sample of muscovite
Banded gneiss
Muscovite, light micrograph
Tourmaline unworked stones
Aquamarine in muscovite matrix
Aquamarine in muscovite matrix, close
Amethyst crystals
Citrine crystals
Amphibolite, light micrograph
Limburgite
Garnet
Peridotite
Garnet in peridotite
Mineral properties, 18th century
'Black' opal cabochon specimen
Mineral samples
Turquoise stones
Rubellite crystals
Rhyolitic geode
Obsidian, a glassy igneous rock
Obsidian
Variety of Igneous Rocks
Obsidian bubbles
Mahogany obsidian
Fuchsite mineral stone
Obsidian flow