Mixed: Igneous And Sedimentary

Jasp-Agate

Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions

Copper Ore

Cupriferous Rock / Mixed Mineral Matrix

Quartz-rich granitic fragment

Granite or granitic pegmatite; chiefly quartz (SiO₂), feldspar, and minor mica

Pink Granite

Intrusive Igneous Rock (high K-feldspar content)

Granite

Felsic intrusive igneous rock

Polished carnelian jasper / brecciated jasper

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

Granite Pebble

Intrusive Igneous Rock (Felsic to Intermediate)

Quartz with impurities or Host Rock

SiO2 (Silicon Dioxide) with mixed silicates

Chakra Stone (Composite / Man-made Bonded Gemstones)

Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)

Eudialyte

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

Mixed Crushed Stone

Aggregate (varied mineral composition)

Fancy Jasper

Silicon Dioxide (SiO2) with iron and organic inclusions

Conglomerate

Sedimentary Conglomerate

Jasper with Quartz

Silicon Dioxide (SiO2) - Chalcedony variety

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

Pegmatite

Pegmatite

Igneous Pegmatite (Quartz, Feldspar, Micas)

Pegmatite

Granitic Pegmatite

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

Banded Amethyst

Silicon Dioxide (SiO2) with iron impurities

Polished granite pebble

Granite; chiefly quartz, feldspar, and mica/amphibole

Tumbled granite or granitic gneiss

Granite, primarily quartz, alkali feldspar, plagioclase, and dark biotite/amphibole

Weathered quartz-rich rock, possibly granite or granitic pegmatite

Indeterminate quartz–feldspar aggregate; likely granite/pegmatite

Red Granite

Granite (Felsic intrusive igneous rock)

Pink granite

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

Pink Granite

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

Gabbro (Water-worn pebble)

Gabbro

Pegmatite with Lepidolite and Feldspar

Pegmatite (containing K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 and KAlSi3O8)

Asphalt Conglomerate

Artificial Bituminous Conglomerate

Banded Chert / Jasper

Silicon Dioxide (SiO2)

Diorite (River Rock/Cobble)

Intermediate Plutonic Igneous Rock (Diorite)

Pink Granite

Granite (Phaneritic Acidic Igneous Rock)

Yellow Jasper

Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)

Mixed sandstone and iron-rich sedimentary rock fragments

Quartz arenite/subarkose, with ferruginous cement and possible iron-oxide staining

Sodalite

Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)

Agate (Lake Superior Agate variant)

Chalcedony / Silicon Dioxide (SiO2)

African Turquoise

African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)

Rounded river pebble

Likely lithic sandstone or weathered quartz-rich rock; exact identification requires testing

Conglomeratic breccia

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

Mixed river gravel (alluvial conglomeratic sediment)

Polymictic alluvium; composition includes quartz, feldspar, chert, granite, basalt, and metamorphic rock fragments

Bauxite

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

Sandstone with Desert Varnish

Arenite with Ferromanganese patina