Mixed

Ruby in Fuchsite

Corundum (Al2O3) in Chrome-Mica (KAl2(AlSi3O10)(OH)2)

Granite Pegmatite

Pegmatite (Quartz, Feldspar, Mica)

Rough amethyst-bearing quartz specimens

Quartz, SiO₂; purple coloration from trace iron and irradiation

Copper Ore (Malachite and Azurite stained rock)

Cupriferous rock containing secondary copper carbonates

Epidosite

Epidosite (composed primarily of Epidote and Quartz)

Fuchsite Quartzite (Aventurine / Verdite)

Quartzite with Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2 in SiO2 matrix)

Tumbled purple chalcedony or low-grade amethyst bead bracelet

Chalcedony (microcrystalline SiO₂), possibly quartz/amethyst; composition is SiO₂

Iron-oxide-rich weathered rock

Limonite/goethite-bearing ironstone; chiefly hydrated iron oxides, often FeO(OH)·nH₂O

Tumbled jasper or chert pebble

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

Tumbled yellow-brown jasper

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

Crushed limestone gravel

Limestone; predominantly calcite (CaCO₃), possibly dolomitic limestone with dolomite (CaMg(CO₃)₂)

Polished chrysocolla-bearing copper mineral specimen

Chrysocolla, Cu₂H₂Si₂O₅(OH)₄·nH₂O, likely mixed with malachite and limonite/goethite

Unidentified coarse-grained rock fragments

Likely granite or granitic rock; exact identification is uncertain from the photograph

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

Mixed beach gravel and cobbles

Polylithic alluvial or littoral clasts, including quartz, quartzite, chert, limestone, sandstone, and flint

Iron-stained conglomerate or breccia

Ferruginous clastic rock; likely quartz-rich sandstone with angular to rounded lithic clasts cemented by iron oxides

Quartz-bearing rock fragment

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

Weathered iron-rich rock, possibly hematite-bearing jasper

Hematite (Fe₂O₃) with quartz/chalcedony and iron-oxide minerals

Chrysocolla

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Hydrated Copper Phyllosilicate)

Granite (Pink/Red)

Phaneritic Igneous Rock (Rich in K-Feldspar)

Conglomerate

Conglomerate (clastic sedimentary rock)

Sodalite and Calcite

Na8(Al6Si6O24)Cl2 (Sodalite) and CaCO3 (Calcite)

K2 Jasper (K2 Granite)

Azulite in Granite (Quartz + Feldspar + Biotite + Azurite)

Chrysocolla

Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O

Quartz-rich granite (likely weathered granite)

Granite, a coarse-grained felsic intrusive igneous rock, composed chiefly of quartz and feldspar with minor mica

Granite pebble

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Concrete-like aggregate surface with embedded rock fragments

Anthropogenic concrete or exposed aggregate; not a natural rock specimen

Gneiss (likely garnet-bearing)

Banded orthogneiss/paragneiss; chiefly quartz, feldspar, biotite and amphibole, with possible garnet

Polished hematite-rich ironstone

Hematite (Fe₂O₃), likely in a magnetite/goethite-bearing ironstone matrix

Gray granite or granitic gneiss gravel

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

Beaded mineral/crystal jewelry (likely turquoise and coral accents)

Variable; blue beads may be turquoise (CuAl6(PO4)4(OH)8·4H2O), with possible dyed howlite, glass, or composite materials

Granodiorite

Granodiorite (intermediate intrusive igneous rock containing plagioclase, quartz, and K-feldspar)

Unakite

Epidotized Granite

Bumblebee Jasper

Anhydrite with Sulfur, Hematite, and Orpiment (SiO2/CaSO4 mixture)

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Tiger's Eye / Hawk's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Mixed rounded gravel and weathered rock fragments

Polymictic alluvial or glacial gravel; composition appears to include basaltic, quartz-rich, and feldspathic clasts

Tumbled granite

Granite, a coarse-grained felsic intrusive igneous rock