Quartzite Pebble
Metamorphic Quartz-rich Rock (SiO2)
metamorphic
Category
Mineral (Synthetic)
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Chert Pebble (Jasper/Quartz variety)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Schist
Mica Schist
metamorphic
Schist
Mica Schist
metamorphic
Granite
Granite (Mainly SiO2 and Al2O3)
igneous
Granite River Pebble
Granite
igneous
Granitic Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)
Igneous
Gneiss
Gneiss
metamorphic
Greenstone / Graywacke
Metagraywacke or Chlorite Schist
metamorphic
Granite
Granite
igneous
Fossilized Shark Tooth (Sand Tiger)
Carcharias sp. (Fossilized Tooth)
fossil
Fossilized Horse Tooth
Equus ferus caballus (fossilized molar/premolar)
fossil
Granite
Granite
Igneous
Sedimentary rock with quartz veining
Laminated siltstone or mudstone with hydrothermal quartz veins
sedimentary
Tiger Shark Fossil Tooth
Galeocerdo cuvier (fossilized)
sedimentary
Megalodon Shark Tooth Fossil
Otodus megalodon
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite in Quartzite/Graphite Matrix
Iron Sulfide (FeS2)
Mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Hematite Beads
Hematite (Fe2O3)
Mineral
Schist
Mica Schist
metamorphic
Shale (possibly Carbonaceous or Oil Shale)
Laminated Mudstone (primarily clay minerals and quartz)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Native Sulfur
Sulfur (S8)
mineral
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Greenstone / Diabase Porphyry
Porphyritic Diabase (Micro-gabbro)
Igneous
Conglomerate
Conglomerate
sedimentary
Porphyritic Basalt
Porphyritic Basalt (Silicate Rock)
igneous
Basalt with Quartz Veins
Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions
igneous
Granite
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Diamond
Diamond (C)
mineral
Unable to Identify (Image Obscured)
Indeterminate
Schist
Mica Schist
metamorphic
Diamond
Diamond (Pure Carbon, C)
mineral
Sandstone with Quartz Vein
Arenite with Quartz (SiO2) Infilling
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Unakite
Epidotized Granite
metamorphic
Granite
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Igneous Rock (Granite)
igneous
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral