Sedimentary And Igneous (Mixed)

Granite

Granitic plutonic rock, chiefly quartz, alkali feldspar, plagioclase, and mica/amphibole

Tumbled pink granite

Granite, primarily quartz, feldspar, and mica; likely pink alkali-feldspar granite

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)

Mixed landscaping gravel and rounded fieldstones

Lithologically mixed aggregate; likely quartzite, basalt, granite, and weathered sedimentary rocks

Landscaping stones

Unidentified natural fieldstones, possibly granite, gneiss, quartzite, and limestone

Garnet

Garnet-group silicate, likely almandine–spessartine; general formula X₃Y₂(SiO₄)₃

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.)

Mixed small pebbles and mineral grains

Unidentified detrital sediment; likely quartz-, feldspar-, and lithic fragments

Asphalt aggregate pavement

Bituminous asphalt concrete containing crushed stone aggregate

Asphalt Conglomerate

Artificial Bituminous Conglomerate

Likely quartz-rich gravel fragment (uncertain identification)

Quartz, silicon dioxide (SiO₂), possibly mixed with feldspar or other light-colored minerals

Mixed rounded beach gravel

Polymictic alluvial or beach clasts, likely including quartzite, limestone, granite, and other silicate rocks

Banded Chert / Jasper

Silicon Dioxide (SiO2)

Copper Ore

Mixed copper sulfides/oxides in gangue matrix

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

Pegmatite

Red Granite

Granite (Felsic intrusive igneous rock)

Fancy Jasper

Silicon Dioxide (SiO2) with iron and organic inclusions

Polished carnelian jasper / brecciated jasper

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

Conglomerate

Conglomerate (clastic sedimentary rock)

Granite Pebble

Intrusive Igneous Rock (Felsic to Intermediate)

Tumbled metallic sulfide mineral specimen, likely pyrite-bearing ore

Likely pyrite (FeS₂) with associated sulfides and host rock; exact identification requires testing

Yellow Jasper

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

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

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)

Eudialyte

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

Conglomeratic breccia (polymict volcanic breccia)

Polymict volcaniclastic breccia; clasts likely basaltic/andesitic rock in a dark matrix

Granite fragment

Granite, chiefly quartz (SiO₂), feldspar, and mica

Granite Pebble

Granite

Granite

Coarse-grained granitic rock, primarily quartz, alkali feldspar, plagioclase, and dark biotite/amphibole

Weathered granite fragment

Granite, chiefly quartz, feldspar, and mica

Mixed beach pebbles; likely quartzite, granite, and iron-stained metamorphic rock

Predominantly quartzite (SiO₂), granite (quartz–feldspar–mica), and weathered iron-rich rock

Tumbled black tourmaline (likely schorl)

Schorl, sodium–iron tourmaline: NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Polymictic conglomerate

Conglomerate; clast-supported polymictic conglomerate in a dark matrix

Rounded river pebble

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