Mixed (Sedimentary, Igneous, And Metamorphic)

Polished carnelian jasper / brecciated jasper

Microcrystalline quartz (SiO₂), chalcedony with iron-oxide pigments and opaque jasper fragments

Conglomerate

Conglomeratic Sandstone

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)

Granite Pebble

Granite (composed primarily of Quartz, Potassium Feldspar, Plagioclase, and Biotite/Amphibole)

Granite Pebble

Intrusive Igneous Rock (Quartz, Feldspar, Mica)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)

Granodiorite (Weathered)

Granodiorite

Granodiorite (containing Biotite and Quartz)

Granodiorite (Plagioclase-rich phaneritic intrusive rock)

Ruby in Fuchsite

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

Gravel and Pavement Aggregates

Unconsolidated rock fragments / detrital sediments

Unakite

Epidotized Granite

Conglomerate

Conglomerate

Quartz with Chlorite / Greenschist

Quartz vein in Greenschist (SiO2 with Chlorite group minerals)

Granite Pebble

Intrusive Igneous Rock (Granite)

Greenstone / Diorite

Intermediate plutonic igneous rock

Tourmaline (Mixed colors)

Boron silicate mineral (Na,Ca)(Li,Mg,Al,Fe,Mn,Ti,V,Cr)3Al6(BO3)3Si6O18(OH,F)4

Fuchsite on Quartz

Muscovite (KAl2(AlSi3O10)(OH)2) with Chromium impurities

Crushed Stone (Gravel/Aggregates)

Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)

Granite

Intrusive Igneous Rock

Conglomerate

Conglomerate

Jasp-Agate

Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions

Unidentified coarse-grained rock fragments

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

Feldspar (Granite Pegmatite matrix)

Potassium Feldspar (KAlSi3O8) / Quartz Mixture

Rough Gemstone Grains (Mixed Sapphires and Quartz)

Corundum (Al2O3) and Quartz (SiO2)

Pink Granite

Intrusive Igneous Rock (high K-feldspar content)

Amazonite with Smoky Quartz and Feldspar

Microcline (KAlSi3O8) with Quartz (SiO2)

Kaolin (China Clay)

Kaolinite [Al2Si2O5(OH)4]

Granite Pebble

Intrusive Igneous Rock (Felsic to Intermediate)

Fancy Jasper

Silicon Dioxide (SiO2) with iron and organic inclusions

Eudialyte

Eudialyte (Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite)

Conglomeratic breccia

Clast-supported polymictic conglomerate/breccia, cemented by silica- or carbonate-rich matrix

Bauxite

Aluminium ore (Hydrated aluminium oxides AlOx(OH)3-2x)

Sandstone with Desert Varnish

Arenite with Ferromanganese patina

Granite

Felsic intrusive igneous rock

Tumbled green jasper (probable serpentine-rich stone)

Jasper, microcrystalline quartz (SiO₂), possibly mixed with serpentine or chlorite

Pegmatite

Igneous Pegmatite (Quartz, Feldspar, Micas)

Pegmatite

Granitic Pegmatite

Banded Chert / Jasper

Silicon Dioxide (SiO2)

Jasper with Quartz

Silicon Dioxide (SiO2) - Chalcedony variety

Banded Amethyst

Silicon Dioxide (SiO2) with iron impurities