Metamorphic Rock (Composed Of Multiple Minerals)

Mixed mineral and rock specimens

Undetermined assortment; individual pieces may include quartz, feldspar, mica, and other common minerals

Quartzite (Yellow/Tan)

Metamorphic Rock composed of Quartz (SiO₂)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Likely banded gneiss fragment

Gneiss, a foliated metamorphic rock (exact mineral identification is uncertain from the image)

Mixed Tumbled Rocks and Minerals Collection

Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)

Yellow chalcedony or quartz fragment

Microcrystalline quartz, SiO₂ (tentative; possibly iron-stained chalcedony)

Dragon Blood Jasper (Dragon Stone)

Epidote-Piemontite/Quartzite Rock

Ventifact

Eolian Ventifact (often composed of basalt, chert, or quartzite)

Likely polished dark stone or mineral specimen (unidentifiable from image)

Undetermined; possibly dark quartz-rich material, basalt, or obsidian

Quartzite River Rock

Quartzite (primarily SiO2)

Small green-gray pebble (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals

Banded Gneiss

Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)

Amphibolite

Amphibolite, composed mainly of amphibole and plagioclase feldspar

Quartzite Pebble

Quartzite (SiO2)

Red Quartzite River Rock

Metamorphic Quartzite (SiO2)

Likely amphibolite

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

Tiger Iron

Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)

Greenschist

Greenschist facies metamorphic rock

Banded sandstone pebble

Quartz-rich lithic sandstone; exact provenance and composition require testing

Faceted gemstones, likely mixed small sapphires or spinel

Corundum (Al₂O₃) or spinel (MgAl₂O₄); exact identification requires testing

Serpentinite

Serpentinite (composed primarily of minerals in the Serpentine group)

Quartz Sand Grain / Micro Crystal

Silicon Dioxide (SiO2)

Likely amphibolite (dark hornblende-rich rock)

Amphibolite, typically composed mainly of hornblende and plagioclase feldspar

Likely amphibolite (hornblende-rich metamorphic rock)

Amphibolite, composed chiefly of amphibole (commonly hornblende) and plagioclase feldspar

Marble

Metamorphic rock primarily composed of Calcite (CaCO3)

Gneiss

Gneiss (Foliated Metamorphic Rock)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Serpentine (polished/tumbled)

Serpentine-group minerals, chiefly antigorite, Mg₃Si₂O₅(OH)₄

Quartzite River Rock

Quartzite (primarily SiO2)

White-and-dark marble or agate-style gemstone bead bracelet

Likely calcite-rich marble (CaCO₃) mixed with dark gray stone beads; exact material is uncertain from the photo

Quartz Vein in Rhyolite

Silicon Dioxide (SiO2) in extrusive igneous rock

Mixed rounded gravel and pebbles

Polymictic clasts, likely including granite, basalt, quartzite, sandstone, and schist

Quartzite Pebble

Quartzite (mostly SiO2)

Riverstone Quartzite (Water-worn Siltstone/Quartzite)

Metamorphosed Quartz-rich Arenite (SiO2)

Dark, coarse-grained rock fragment (possibly amphibolite or gabbro)

Uncertain from the photo; likely amphibolite (hornblende-rich metamorphic rock) or a mafic igneous rock such as gabbro

Likely amphibolite

Amphibolite, composed mainly of hornblende and plagioclase feldspar

Lapis Lazuli

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

River Rock

Sedimentary clast

Dark foliated metamorphic rock, likely amphibolite

Amphibolite, typically composed mainly of hornblende and plagioclase feldspar

Greenstone pebble (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals

Lapis Lazuli

Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2