Metamorphic Rock (Primarily Composed Of Minerals)

Quartzite

Quartzite (primarily SiO2)

Jasper (Iron-stained Chalcedony)

SiO2 with Fe2O3 (Iron Oxide) impurities

Green Aventurine

Silicon Dioxide (Quartz variety) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Quartzite Pebble (River Rock)

Quartzite (primarily SiO2)

Quartz

Silicon Dioxide (SiO2)

Bumble Bee Jasper

Volcanic Tuff (mixture of SiO2, CaCo3, S, and As2S3)

Epidosite

Epidosite (Metasomatic rock consisting mainly of Epidote and Quartz)

Shale

Shale (composition varies: primarily clay minerals and quartz)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Hematite/Limonite oxides)

Basalt

Basalt (Mafic volcanic rock)

Rhodonite

Rhodonite; (Mn,Fe,Mg,Ca)SiO3

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Wishing Stone with Quartz Vein

Hydrothermal Quartz Vein in Metasedimentary Matrix (primarily SiO2)

Unakite

Epidotized Granite

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Limonitic Iron Ore / Goethite

Hydrated Iron(III) oxide-hydroxide (primarily FeO(OH)·nH2O)

Jadeite

Jadeite (NaAlSi2O6)

Rough Sapphire (Corundum)

Corundum (Al2O3)

Blue Sapphire

Corundum (Al2O3)

Slickenside

Tectonic Fault Scarp Surface

Quartzite with inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Granite

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Quartzite

Quartzite (primarily SiO2)

Epidote in Granite Gneiss

Epidote bearing Orthogneiss (Ca2(Al,Fe)3(SiO4)3(OH))

Desert Rose (also known as Sand Rose)

Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions

Basalt

Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)

Quartzite Cobble

Quartzite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (with Iron Oxides)

Basalt (Weathered Pebble)

Extrusive mafic igneous rock; minerals primarily Plagioclase feldspar and Pyroxene

Quartzite Cobble

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Arkosic Sandstone (or Conglomeritic Sandstone fragment)

Arkose (rich in feldspar)

Amygdaloidal Basalt with Quartz/Zeolite Infill

Amygdaloidal Basalt (extrusive volcanic rock with SiO2 or CaAl2Si3O10·3H2O infill)

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

Aragonite Star Cluster

Aragonite (Calcium Carbonate, CaCO3)

Pyrite

Iron Disulfide (FeS2)

Granite (Thin Section)

Granite (Felsic Plutonic Rock)

Vesicular Basalt with Secondary Mineral Inclusions

Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)