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