Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock)
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Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Banded Agate
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist
metamorphic
Mica Schist with Pyrite
Muscovite/Biotite Schist with Iron Sulfide (FeS2)
metamorphic
Orange Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Iolite-bearing Gneiss (Cordierite)
Cordierite (Mg2Al4Si5O18) in Gneiss matrix
metamorphic
Weathered iron-rich concretion or ironstone nodule
Goethite–hematite limonite concretion (FeO(OH), Fe₂O₃, and hydrated iron oxides)
sedimentary
Granite
Plutonic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Milky Quartz with Mineral Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Olivine-bearing Basalt / Scoria
Mafic Igneous Rock (primarily (Mg, Fe)2SiO4)
igneous
Blue sodalite beads
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
sedimentary
Mica Schist
Schist (muscovite/biotite rich regional metamorphic rock)
metamorphic
Granitic Pegmatite
Granite Pegmatite (principally KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Fulonite (Fulgurite-like)
Fulgurite (SiO2 fused silica/lechatelierite)
Metamorphic (Pseudo-igneous)
Agate and Amethyst (Quartz variants)
Silicon Dioxide (SiO2) - Microcrystalline Quartz and Crystalline Quartz
mineral
Chert (specifically Flint or Gray Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Sapphire
Corundum (Al2O3)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Zinc Alloy (Silver-plated)
Zinc Alloy Casting (Zn-Al-Mg-Cu)
mineral (refined metal)
Polished copper-bearing rock, likely cuprite-rich copper ore
Cuprite (Cu₂O) with native copper and iron-oxide matrix, probable
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic sedimentary rock)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich Sedimentary-to-Metamorphic Rock)
metamorphic
Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
mineral
Pink Quartzite
Quartzite (primarily SiO2 with trace impurities of iron oxides)
metamorphic
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Chert (specifically tan/pink variety)
Silicon Dioxide (SiO2)
sedimentary
Bouncy Ball (Synthetic Rubber Polymer)
Polybutadiene / Ethylene Vinyl Acetate (EVA)
Synthetic material (Not a rock or mineral)
Banded Agate (specifically Sardonyx)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Asphalt / Bituminous Aggregate
Bituminous mixture (Hydrocarbon-based sediment)
sedimentary
Greywacke (River Pebble)
Greywacke sandstone with quartz veining
sedimentary
Raw greenish-blue quartz-bearing mineral specimen
Likely fluorite or chalcedony/quartz; exact identification requires hardness and crystal tests
mineral
Weathered fossiliferous sandstone or mudstone cobble
Lithified siliciclastic sediment; the raised curved feature may be a trace fossil or shell impression
sedimentary
Pegmatite (Granitic Pegmatite)
Pegmatite (Quartz + Potassium Feldspar + Mica)
igneous
Pyrite (Fool's Gold)
Iron Pyrite (FeS2)
mineral