Mineral (Man Modified)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Emerald

Beryl (Be₃Al₂(SiO₃)‑₆) with Chromium/Vanadium impurities

Quartz vein rock

Milky quartz with smoky quartz; chiefly silicon dioxide (SiO₂)

White quartz-rich rock, possibly milky quartz

Quartz (SiO₂), likely massive milky quartz; identification is uncertain from the image

Banded gneiss pebble

Gneiss, commonly quartz–feldspar–mica gneiss

Milky quartz (rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Weathered stone nodule or concretion

Unidentified lithic concretion; composition cannot be determined from the image

Garnet

Garnet group species (likely Almandine, Fe3Al2(SiO4)3)

Iron-stained quartz, possibly smoky quartz

Quartz (SiO₂), with reddish-brown iron-oxide staining; exact variety is uncertain from the photo

Black Obsidian

Volcanic Glass (predominantly SiO2)

Polished green tumbled stone, likely serpentine

Serpentinite (rock composed chiefly of serpentine-group minerals, approximately Mg₃Si₂O₅(OH)₄)

Serpentinite (likely)

Serpentine-group minerals, chiefly antigorite/lizardite; commonly with magnetite and relic olivine/pyroxene

Likely garnet crystal fragment

Garnet-group mineral, possibly almandine (Fe₃Al₂(SiO₄)₃)

Quartz geode or drusy quartz cluster

Quartz (silicon dioxide, SiO₂), likely a quartz-lined cavity in host rock

Quartz-bearing rock, likely iron-stained milky quartz

Quartz (SiO₂) in a likely iron-oxide-stained host rock; exact host is not identifiable from the image

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Weathered quartz-rich rock, possibly quartzite or granite fragment

Quartzite (SiO₂-dominant) or altered granitoid; uncertain from image

Blue calcite (rough fragment)

Calcite, CaCO₃

Dark basalt or basaltic volcanic rock

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine

Chalcopyrite-bearing metamorphic rock (possibly bornite/chalcopyrite ore)

Likely quartz–sulfide rock containing chalcopyrite (CuFeS₂); identification from the image is tentative

Quartz-bearing rock fragment

Likely milky quartz with iron-oxide staining and possible host-rock minerals; exact identification is uncertain from the image.

Azurite–malachite-bearing copper ore

Azurite (Cu₃(CO₃)₂(OH)₂) with malachite (Cu₂CO₃(OH)₂), in a copper-rich host rock

Likely iron-rich sandstone or ironstone

Ferruginous sandstone/ironstone; exact identification is uncertain from the photograph

Tumbled tourmalinated quartz

Quartz (SiO₂) with black tourmaline (schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) inclusions

Turquoise cabochon ring

Turquoise, hydrated copper aluminum phosphate (CuAl₆(PO₄)₄(OH)₈·4H₂O); the stones may be stabilized or treated

Granite

Coarse-grained felsic intrusive igneous rock; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende

Polished red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Granite Pebble

Granite (composed primarily of Quartz, Feldspar, and Mica)

Polished granite pebble

Granite, typically quartz–feldspar–mica aggregate

Likely basalt or dark mafic rock fragment

Basalt; primarily plagioclase feldspar and pyroxene, commonly with olivine and iron oxides

Likely tumbled basalt or vesicular volcanic rock

Basalt, possibly amygdaloidal basalt

Likely blue-green kyanite crystal

Kyanite, Al₂SiO₅

Granite (likely biotite-bearing granite)

Coarse-grained felsic intrusive rock, mainly quartz, feldspar, and dark biotite or amphibole

Weathered quartz-rich rock, likely milky quartz with iron staining

Quartz (SiO₂), possibly quartz vein material or quartzite

Tumbled red/orange jasper

Jasper, microcrystalline quartz (chalcedony; SiO₂) with iron-oxide impurities

Likely milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Milky quartz pebble

Quartz (SiO₂), likely massive or vein quartz

Weathered granite or granitic gneiss pebble

Granite; primarily quartz, feldspar, and mica (exact identification is uncertain from the image)

Weathered graywacke or sandstone with a dark mineral-rich vein

Likely lithic graywacke/sandstone; dark material may be quartz, iron-manganese oxide, or sulfide mineralization

Honey calcite (likely)

Calcite — calcium carbonate, CaCO₃

Greenstone (likely chlorite- or epidote-rich metamorphic rock)

Greenstone; commonly metamorphosed basalt or dolerite, with chlorite, epidote, and actinolite

White drusy quartz

Quartz, silicon dioxide (SiO₂), with a drusy coating of tiny crystals