Aventurine
Aventurine Quartz (SiO2 with inclusions)
metamorphic
Category
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Yellow Agate
Silicon Dioxide (SiO2)
mineral
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Pink Chalcedony (Agate/Jasper blend)
Silicon Dioxide (SiO₂)
mineral
Agate (specifically Chalcedony nodule)
Silicon Dioxide (SiO2)
mineral
Granite Pegmatite with Muscovite Mica
Granite Pegmatite (Silicon Dioxide and complex silicates)
igneous
Quartz with Pyrite and Iron Staining
Silicon Dioxide (SiO2) with Iron Disulfide (FeS2) inclusions
mineral
Jasper with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Shale or Mudstone (Based on appearance)
Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)
Sedimentary
Nephrite Jade
Nephrite
Mineral/Rock
Desert Rose
Gypsum (CaSO4·2H2O) or Baryte (BaSO4) with trapped sand grains
mineral
Sandstone (Greywacke/Lithic Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Liesegang Stone (Sandstone with Liesegang Rings)
Clastic sedimentary rock with li-secondary iron oxide mineralization
sedimentary
Red Granite
Felsic Intrusive Igneous Rock
igneous
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Granite
Granite
igneous
Quartz / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (Igneous Volcanic Rock)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Basalt
Extrusive Mafic Igneous Rock
igneous
Coral Fossil (Petrified Coral)
Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz Pebble (Geode-like)
Silicon Dioxide (SiO2)
Mineral
Quartz (Milky and Smoky variety)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated copper and aluminum phosphate (CuAl6(PO4)4(OH)8·4H2O)
mineral
Red Sandstone Pebble
Arenite with Hematite (Fe2O3) cement
sedimentary
Chatoyant Quartz (Cat's Eye Quartz)
Silicon Dioxide (SiO2) with fibrous inclusions of Amphibole or Rutile
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Fe2O3 staining)
sedimentary
Granite
Granite (High-silica plutonic rock)
Igneous
Quartz (Common Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Charoite
Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral