Tumbled quartz-rich stone, possibly blue quartz or granite
Quartz (SiO₂), with probable feldspar and dark accessory minerals
mineral
Category
Mineral_rock
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Petrified Wood
Silicified Wood (SiO2)
fossil
Epidote-bearing Rock / Epidote Inclusion
Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock
mineral
Mica Schist
Metamorphic rock dominated by mica minerals
metamorphic
Biotite Schist (likely)
Biotite Schist (rock), Biotite (mineral)
Metamorphic
Granite
Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)
igneous
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Fossilized Shark Tooth
Elasmobranchii gen. indet.
fossil
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Epidote
Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Fossilized Shark Tooth
Chondrichthyes (Class) fossilized tooth
fossil
Quartz (Clear/Smoky Geode fragment)
Silicon Dioxide (SiO2)
mineral
Tumbled Mixed Gemstones and Rocks
Various mineral species including quartz (SiO2) and silicate minerals
mineral
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Pegmatite
Igneous Pegmatite (Quartz-Feldspar-Biotite)
igneous
Satin Spar (Satin Spar Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal on Matrix
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Pegmatite
Igneous Pegmatite
igneous
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Granitic Gneiss
Gneiss (Complex silicate composition)
metamorphic
Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)
Mixed Silicates and Sulfides (SiO2, FeS2)
mineral
Petrified Wood
Silicified Wood (SiO2 / Quartz pseudomorph after wood)
fossil
Amygdaloidal Basalt
Basalt with secondary mineral infilling (SiO2/CO3)
igneous
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Carved Stone Turtle
Carved Soapstone and Quartz
mineral
Silver
Ag (Native Silver)
mineral
Bronzite
MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)
Mineral
Unidentified gray stone
Likely quartz-rich stone; exact identification is not possible from the image
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)
igneous
Quartz pebble
Silicon dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gossan (Iron Hat)
Limonitic Gossan (predominantly FeO(OH)·nH2O)
igneous/metamorphic derivative
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Shale
Shale (Lutite)
sedimentary
Quartz Vein in Greenstone
Metamorphic rock with quartz vein (SiO2 / mixed silicates)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary