Mixed

Tumbled jasper or chalcedony pebble

Microcrystalline quartz (SiO₂), likely jasper/chalcedony with iron-oxide staining

Feldspar (Granite Pegmatite matrix)

Potassium Feldspar (KAlSi3O8) / Quartz Mixture

Tonsil Stone (Tonsillolith)

Calcium phosphate / Calcium carbonate biomineral

Jasper and Greenstone Pebble

Siliceous rock / Metamorphic pebble

Unakite

Granitic rock composed of pink orthoclase feldspar, green epidote, and clear quartz

Granite Pebble

Intrusive Igneous Rock (Granite)

Greenstone / Diorite

Intermediate plutonic igneous rock

Pink Granite

Intrusive Igneous Rock (high K-feldspar content)

Granite Pebble

Intrusive Igneous Rock (Felsic to Intermediate)

Jasper Rose Quarts / Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite inclusions

Epidote in Quartz

Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH)) / Quartz (SiO2)

Banded Amethyst

Silicon Dioxide (SiO2) with iron impurities

Arkosic Sandstone (or Conglomeritic Sandstone fragment)

Arkose (rich in feldspar)

Greenstone or Epidote-rich rock

Epidote or Chlorite schist/greenstone

Mossy Rock

Mixed lithology rock with Bryophyta (moss)

Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)

Mixed Silicates and Sulfides (SiO2, FeS2)

Migmatite

Migmatite (Mixed metamorphic-igneous rock)

Silver (Sterling Silver Jewelry)

Argentum (Ag) mixed with Copper (Cu)

Jasper (Green Jasper/Heliotropic Chert)

Silicon Dioxide (SiO₂)

Pegmatite (Granitic Pegmatite with Quartz, Mica, and Tourmaline/Biotite)

Pegmatite

Chrysocolla in Matrix

Hydrated copper silicate - (Cu,Al)2H2Si2O5(OH)4·nH2O

Pegmatite

Igneous Pegmatite (Quartz, Feldspar, Micas)

Chrysocolla in Matrix

Hydrated copper silicates (Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O))

Chrysocolla on Quartz

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) with Quartz (SiO2)

Greywacke

Lithic Sandstone (Greywacke)

Conglomerate

Conglomerate (Clastic sedimentary rock)

Pegmatite

Granitic Pegmatite

Weathered granitic rock fragment

Likely granite or granodiorite, composed mainly of quartz, feldspar, and mica

Fuchsite

Chromium-rich Muscovite Mica

Mixed river stones and gravel

Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate

Tumbled Mixed Gemstones (Quartz and Rutile)

Silicon Dioxide (SiO2) with various inclusions

Asphalt Concrete

Bituminous Concrete (Anthropic Rock)

Chert Pebble

Chert (Microcrystalline Quartz, SiO2)

Copper Ore

Cupriferous Rock / Mixed Mineral Matrix

River Pebbles (including Granite and Basalt)

Mixed Igneous Rocks (Granite, Basalt)

Polygenetic Conglomerate (Puddingstone)

Conglomerate (SiO2 matrix with mixed clasts)

Quartz with impurities or Host Rock

SiO2 (Silicon Dioxide) with mixed silicates

General Gravel (River Rock/River Stones)

Mixed Lithic Sediments (Conglomerate Clasts)

Dalmation Stone

Peralkaline Rock (mixed silicate minerals)

Gossan (Iron Cap)

Limonitic Gossan (Fe2O3·nH2O mixed)

Weathered quartz-rich rock, possibly granite or granitic pegmatite

Indeterminate quartz–feldspar aggregate; likely granite/pegmatite

Pink granite

Coarse-grained granitic rock, chiefly orthoclase microcline feldspar, quartz, and dark biotite/amphibole