Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Category
Man Made Object (Metalwork)
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Rhodonite
(Mn,Fe,Mg,Ca)SiO3
mineral
Quartz Crystal Cluster / Quartzite
Silicon Dioxide (SiO2)
mineral
Weathered fossiliferous limestone fragment, possibly fossil coral or shell material
Indeterminate carbonate fossil in calcitic limestone; likely composed mainly of calcite (CaCO₃), but species identification is not possible from this image alone
fossil
Granite
Phaneritic Felsic Igneous Rock
igneous
Serpentinite (serpentinized ultramafic rock)
Serpentine-group minerals, chiefly lizardite and antigorite; commonly derived from peridotite
metamorphic
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Granite Pebble
Granite (Felsic Intrusive Igneous Rock)
igneous
Pink Granite
Granite (Phaneritic igneous rock rich in Alkali Feldspar)
igneous
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with iron oxide cement)
sedimentary
Scoria
Scoriaceous Basalt
igneous
Chert (also known as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Granite
Granite (High-silica plutonic rock)
igneous
Ruby
Corundum (Al2O3 with chromium impurities)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2 with various lithic fragments)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Jade
Jadeite or Nephrite (NaAlSi2O6 or Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Chert (with Quartz veins)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (or potentially massive Quartz/Quartzite)
SiO2 (Silicon Dioxide)
sedimentary (if chert) / metamorphic (if quartzite)
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Likely limestone or calcareous fossil fragment
Calcite-rich carbonate rock; possibly bioclastic limestone (CaCO₃)
sedimentary
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Orange Quartz
Silicon Dioxide (SiO2) with iron inclusions
mineral
Diamond (Pear Cut)
Carbon (C)
gemstone
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Dyed Agate
Chalcedony (SiO2)
Mineral
Biotite (Black Mica)
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Pumice and Scoria
Vesicular Volcanic Rock (Pumice: Silicic / Scoria: Mafic)
igneous
Multi-Gemstone Quartz Bracelet (Amethyst, Aventurine, Rose Quartz, Clear Quartz)
Silicon Dioxide (SiO2) mixture
gemstone
Quartz Grain
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Jadeite
Jadeite (NaAlSi2O6)
gemstone
Turquoise
Turquoise (Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O)
Mineral