Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Industrial Byproduct (Anthropogenic Material)
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Quartzite River Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Olivine (often within Peridotite)
Magnesium iron silicate, (Mg,Fe)2SiO4
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Shale or Siltstone
Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond
Diamond (pure carbon, C)
mineral
Chert (Flint)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Diamond
Native Carbon (C)
mineral
Peridotite (Dunite/Peridot Xenolith)
Peridotite (predominantly Olivine (Mg, Fe)2SiO4)
igneous
Olivine Peridotite
Peridotite (comprising Olivine (Mg,Fe)2SiO4 and Pyroxene)
igneous
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
sedimentary
Quartzite
Quartzite
metamorphic
Mica Schist
Foliated Metamorphic Rock (Schist)
metamorphic
Olivine/Peridot
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Basalt (Water-worn pebble)
Mafic Igneous Rock (primarily Plagioclase feldspar and Pyroxene)
igneous
Sapphire (Rough)
Corundum (Al2O3)
mineral
Fossiliferous limestone, possibly an oyster or other bivalve fossil
Calcite (CaCO₃) shell material preserved in micritic limestone; exact fossil taxon cannot be confirmed from one image
fossil
Diamond
Carbon (C), Native Element
mineral
Amethyst geode
Quartz (SiO₂), purple variety amethyst; commonly in basalt-hosted geodes
mineral
Granite Pebble
Felsic Plutonic Rock (primarily Quartz, Feldspar, and Mica)
igneous
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Pink Cubic Zirconia (CZ)
Zirconium Dioxide (ZrO2)
mineral (synthetic)
Weathered dark rock fragment
Indeterminate; possibly basalt or iron-rich volcanic rock
igneous
Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
mineral
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossilized shell fragment
Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment
fossil
Diamond (as set in a gold ring)
Carbon (C)
mineral
Basalt River Pebble
Basalt
igneous
Granite
Phaneritic intrusive igneous rock (Composition: Quartz, Feldspar, Mica)
igneous
Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Porphyritic Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Diamond
Carbon (C)
mineral
Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)
Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)
metamorphic
Rounded brown pebble, likely weathered sandstone or iron-stained quartzite
Probable quartz-rich sandstone (SiO₂-dominated); exact identification requires testing
sedimentary
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary