Metamorphic Rock (Composed Of Multiple Minerals)

Quartzite

Quartzite (Metamorphic rock composed primarily of quartz)

Gneiss

Gneiss

Quartzite Cobble

Quartzite (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Rounded river pebbles (mixed lithologies)

Water-worn clasts; individual stones cannot be identified precisely from the image

Polished gneiss pebble

Quartz–feldspar–mica gneiss (exact mineral identification is uncertain from the image)

Dalmatian Stone

Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)

Gneiss (specifically Granitic Gneiss)

Gneiss (composed primarily of Quartz, Feldspar, and Biotite/Amphibole)

Basalt

Basalt

Likely greenstone (metamorphosed basalt)

Metabasalt; commonly composed of chlorite, actinolite, epidote, and albite

Lapis Lazuli (Raw)

Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S

Quartzite River Cobble

Quartzite (primarily SiO2)

Likely amphibolite

Amphibolite, composed mainly of hornblende (amphibole) and plagioclase feldspar

Greenstone / Greenschist

Greenschist (composed of Chlorite, Epidote, Actinolite)

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Serpentinite

Serpentinite (a rock composed predominantly of serpentine group minerals)

Lapis Lazuli

Lapis Lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Likely amphibolite

Amphibolite, composed mainly of hornblende and plagioclase feldspar

Quartzite Cobble

Quartzite (principally SiO2)

Amphibolite (likely)

Amphibolite, composed mainly of hornblende-group amphibole and plagioclase feldspar

Mixed beach-stone and tumbled-glass collection

Predominantly uncertain rocks (likely basalt, granite, and quartz-bearing stones) with anthropogenic glass; one possible banded agate or jasper

Likely milky quartz, possibly quartz-rich vein rock

Quartz (SiO₂); identification from the image is uncertain

Mixed polished gemstone and mineral collection

Primarily quartz varieties (SiO₂), plus probable aventurine, rose quartz, amethyst, agate, jasper, serpentine, feldspar, and possibly dyed or man-made glass pieces

Banded gneiss pebble

Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole

Weathered granite

Granite, a quartz–feldspar–mica intrusive igneous rock

Eclogite

Eclogite

Quartzite Pebble

Quartzite (SiO2)

Greenstone pebble (identification uncertain from photo)

Greenstone, typically metamorphosed mafic rock composed of chlorite, actinolite, and epidote

Banded river pebble, likely gneiss

Foliated quartz–feldspar rock, possibly banded gneiss

Lapis Lazuli (Low Grade)

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)

Banded gneiss

Gneiss, composed mainly of quartz, feldspar, and mica

Gray Slate Pebble

Slate (metamorphosed mudstone/shale)

Likely serpentinite (green serpentine rock)

Serpentinite, composed chiefly of serpentine-group minerals (antigorite, lizardite, and/or chrysotile)

Mixed rock and mineral collection

Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials

Banded Igneous Dike Rock

Intrusive igneous rock with felsic/mafic banding

Gneiss (High-Grade Metamorphic Rock)

Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)

Mixed rock and mineral collection

Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks

Gneiss (specifically a Granitic Gneiss)

Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)

Tumbled granite

Granite, a coarse-grained felsic intrusive igneous rock

Greenstone / Greenschist

Greenschist facies metamorphic rock (composed primarily of chlorite, actinolite, and epidote)

Rough Apatite in Matrix

Fluorapatite / Chlorapatite / Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))

Slate

Foliated Metamorphic Rock (composed of quartz, illite, chlorite)