Gneiss
Anatextite gneiss
Gneiss, light micrograph
Gneiss with garnet
Becket Granite Gneiss, Massachusetts, USA
Sample of gneiss
Gneiss with garnet, light micrograph
Augen Gneiss
Banded Gneiss
Hinsdale Gneiss, Massachusetts, USA
Stamford Granite Gneiss
Muscovite and feldspar
Migmatite
Polished sphere of orbicular jasper
Folded gneiss
Magnification of grain of gneiss rock
Polished sphere of ocean jasper
Conichalcite and adamite
Calcite on sphalerite
Hedyphane
Malachite on jasper
A lump of translucent agate
Folded gneiss and old bridge
Variety of Metamorphic Rocks
Orange lichen on glacier polished rock
Folded strata in gneiss rock
Folded gneiss at Lavertezzo, Switzerland
Migmatite, light micrograph
Orthogneiss, light micrograph
rhodonite gemstone
Prismatic crocoite crystals
Lapis lazuli specimen
Gneiss with boudin at Lavertezzo, Switzerland
Muscovite, polarised light micrograph
Chamosite in rock groundmass
Jamesonite in rock groundmass, close-up
Halloysite, a form of Kaolinite
Opal
Banding patterns
Pegmatite intrusion into gneiss rock
Paragneiss, light micrograph
Glaucophane crystals in rock groundmass
Quartz vein in gneiss rock
Rose quartz gemstones
Iron pyrite
Ammolite gemstone
Lizardite in serpentine rock
Granular celsian
Short, prismatic phosgenite crystals in rock groundmass
Cinnabar on calcite rock groundmass
Marcasite crystals on chalk groundmass
Lilac jadeite
Childrenite crystal in quartz
Prismatic parallel crystals of allanite
Kaolinite in rock groundmass
Helvite crystals in rock groundmass
Dolomite in Quartz Groundmass
Clinochlore crystals in rock groundmass
Aegirine crystal in rock groundmass
Cordierite crystals in rock groundmass
Riebeckite crystals in groundmass
Microcline in rock groundmass
Bunter sandstone
Montmorillonite crystals in bentonite
Microstructures in gneiss rock
Microstructures in gneiss
Assortment of Gemstones
Polished variscite stone
Carnelia
Tiger's Eye
rose quartz
Anthracite coal
Millerella fossils in polished limestone
Jasper specimen
Pink quartz heart
Datolite crystals
Datolite
Botryoidal hematite
Azurite crystals
Larimar Pectolite
Blue Cavansite rosette in rock groundmass
Yellow cancrinite in syenite
Paragneiss
Widmanstatten pattern II
Lewisian Gneiss
Sample of biotite
Trapezohedral leucite crystal
Flos ferri aragonite in rock groundmass
Willemite crystal
Banded flint
Pyrite Nodule
Widmanstatten pattern I
Oval polished green Chrysoprase
Round polished Common Opal
Polished oval Hawk's Eye Quartz
Calcite in mudstone
Nagyagite
Hedenbergite
Green Fuchsite in rock groundmass
Crimson Erythrite on rock groundmass
Emerald crystal, close up
Near metallic lustre of anthracite rock
Glassy white adularia on groundmass
Green apophyllite in stilbite groundmass
Polished vivid blue chrysocolla pebble
Crust of uvarovite on rock groundmass
Kammererite crystals on groundmass
Blue Kyanite crystals in groundmass
Green spherical prehnite crystals
Yellow Pollucite in coarse granite
Purple sugilite on rock groundmass
White Meionite crystal in rock groundmass
Biotite in rock groundmass
Pyrophyllite and quartz in groundmass
Nacrite in groundmass
Harmotome on rock groundmass
Diopside crystals in groundmass, close-up
Ankerite crystals in groundmass, close-up
Crystalline hemimorphite in groundmass
Chlorargyrite in limonite groundmass
Tungstite in quartz groundmass, close-up
Beryl in rock groundmass, close-up
Franklinitein calcite groundmass
Heulandite in rock groundmass, close-up
Richterite in quartz groundmass
Microlite crystals in groundmass
Pink-white chabazite in basalt groundmass
Chromite in serpentinite groundmass
Olivenite in quartz groundmass, close-up
Chalcanthite crystals in rock groundmass
Glaucodot crystals in groundmass
Ilmenite in feldspar groundmass
Rhodonite crystals in rock groundmass
Boleite crystals in gypsum groundmass
Clinoclase and olivenite crystals
Phlogopite in mica schist groundmass
Torbernite in iron-rich groundmass
Talc in groundmass, close-up
Bismuthinite crystals in rock groundmass
Sphene crystals in groundmass, close-up
Rutile in rock groundmass
Hiddenite crystal
Sample of sandstone
Sample of shale
Pyrite crystals
Dioptase crystals
Fluorite crystals
Apatite crystal
Jasper
Malachite
Campo del Cielo meteorite fragment
Malachite mineral sample
Cobalt calcite mineral sample
Selenite mineral sample
Quartz monzonite
Iris agate
Fairburn agate
Union road agate
Lysite agate
Moss agate
Lake Superior agate
Paint rock agate
Paul Bunyon plume agate
Siam Siding agate
Plume agate
Fourth of July Butte agate