Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Category
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Lapis Lazuli (Low-grade)
Lapis Lazuli (Aggregate of Lazurite, Calcite, and Pyrite)
metamorphic
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite
Granite (interlocking crystals of quartz, feldspar, and mica)
igneous
Beach Pebble (Basalt / Greywacke)
Basalt (or fine-grained Sedimentary Greywacke)
igneous
Glaucophane / Blue Schist
Glaucophane (Na2(Mg3Al2)Si8O22(OH)2)
metamorphic
Granite (likely weathered granite or granitic gneiss)
Granite; chiefly quartz (SiO₂), feldspar, and mica
igneous
Quartz (Milky / Clear Quartz Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (with Iron Inclusions)
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Vesicular volcanic rock, likely scoria
Scoria; composition commonly basaltic to andesitic, rich in plagioclase and pyroxene
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ocean Jasper or Orbicular Jasper
SiO2
mineral
Geode (Unopened)
Silicon Dioxide (SiO2) in sedimentary vugs
sedimentary
Granitic Gneiss
Gneiss (Metamorphic rock of granitic composition)
metamorphic
Quartz Pebble (with Feldspar/Mica)
Granitic Quartz / SiO2 with KAlSi3O8
igneous
Amygdaloidal Basalt
Extrusive mafic igneous rock with amygdules
igneous
Quartz Geode
Silicon Dioxide (SiO2) in Geode formation
mineral
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with FeO/Fe2O3)
sedimentary
Amygdaloidal Basalt with Zeolite/Quartz Infill
Amygdaloidal Basalt (Host: (Mg,Fe)2SiO4 / CaAl2Si2O8; Infill: SiO2 or Na2Al2Si3O10·2H2O)
igneous
Banded Pebble (Metamorphic Slate or Gneiss with Quartz Veining)
Metamorphic Rock with Quartz/Calcite Veins
metamorphic
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Granitic Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)
Igneous
Fossil bivalve shell
Fossilized or partially mineralized bivalve; exact genus cannot be determined from the image
fossil
Granite
Felsic intrusive igneous rock
igneous
Quartz-bearing rock fragment
Likely quartz (SiO₂) with iron-oxide staining and possible host-rock grains
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (Hydrated magnesium iron silicate)
metamorphic
Limonite (Ironstone)
Limonite (FeOO·nH2O)
mineral
Lapis Lazuli
Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Banded Sedimentary Rock
Sedimentary rock with Liesegang banding
sedimentary
Sandstone with Manganese Oxide Patina
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Granite Glacial Erratic
Intrusive Phaneritic Felsic Rock (Granite)
igneous
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Fossil Snail
Gastropoda (fossilized)
fossil
Feldspar
Potassium Feldspar (KAlSi3O8)
mineral
Chalcedony (Botryoidal Agate vein)
Chalcedony (Microcrystalline Quartz) - SiO2
mineral
Basalt with Secondary Mineral Inclusions
Amygdaloidal Basalt (Mafic volcanic rock, primarily Augite and Plagioclase)
igneous
Banded Agate
Cryptocrystalline variety of Quartz (SiO2)
mineral