Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
mineral
Category
Man Made Material (Metal)
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Slag (Industrial By-product)
Glassy silicate or metallic smelting residue
mineral-like (anthropogenic)
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Precious Coral (Red Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Granite
Felsic intrusive igneous rock
igneous
Pink Granite (Alkali-feldspar Granite)
Felsic intrusive igneous rock (composition: KAlSi3O8, SiO2, NaAlSi3O8)
igneous
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
Diamond
C (Carbon)
gemstone
Quartzite
Metamorphic Quartz Sandstone
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite (likely Iron-stained)
SiO2 (Metamorphosed Sandstone)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite (Water-Worn)
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite (River Pebble)
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Quartzite (Potentially Ferruginous)
Quartzite (SiO2)
metamorphic
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Seven Chakra Bonded Stone
Bonded composite of Red Jasper, Carnelian, Tiger's Eye, Aventurine, Lapis Lazuli, Amethyst, and Clear Quartz
metamorphic
Banded Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Granite
Intrusive Felsic Igneous Rock (primarily Quartz and Feldspar)
igneous
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Obsidian
Volcanic glass
igneous
Chert (Flint nodule)
Chert (SiO2)
sedimentary
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Obsidian
Volcanic glass (SiO2)
igneous
Sunstone
(Ca,Na)((Al,Si)2Si2O8) - Plagioclase Feldspar
mineral
Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Chert (Yellow Jasper/Flint pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral