Granite
Intrusive Igneous Rock
igneous
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Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH,F)4)
mineral
Obsidian
Volcanic glass
igneous
Obsidian
Volcanic Glass (Silica / SiO2)
igneous
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Granite Gneiss
Gneiss (Derived from Granite protolith)
metamorphic
Red Granite
Intrusive Igneous Rock (Felsic)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Basalt (Porphyritic Basalt)
Extrusive Igneous Rock
igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Rhodonite
Inosilicate (Manganese Iron Magnesium Calcium Silicate, (Mn,Fe,Mg,Ca)SiO3)
mineral
Quartzite with Quartz Veins
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Polished Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Shale or Siltstone
Fine-grained siliciclastic sedimentary rock
sedimentary
Tourmalinated Quartz / Tourmaline in Matrix
Silicate mineral group (Schorl / Quartz)
mineral
Geode
Quartz / Chalcedony nodule
sedimentary
Diamond
Carbon (C)
gemstone
Turquoise
Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O
gemstone
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
mineral
Amethyst
Quartz (SiO2)
gemstone
Opalite
Synthetic glass / Opalized glass
gemstone
Hemimorphite or Red Quartz
SiO2 (Quartz) / Zn4Si2O7(OH)2·H2O (Hemimorphite)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Rhyolite
Extrusive igneous rock (felsic)
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
River Cobble (Quartzite / Porphyritic Igneous Rock)
Siliceous rock / Water-worn lithic fragment
igneous
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Jasper Pebble
Microcrystalline Quartz (Chalcedony)
sedimentary
Pebble
Clast (Lithic fragment / Quartzite pebble)
sedimentary
Diorite
Intermediate intrusive igneous rock
igneous
Diorite
Intermediate plutonic igneous rock
igneous
Granite
Intrusive igneous rock (Felsic)
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Quartz pebble with calcite
Silicon dioxide (SiO2) with Calcium carbonate (CaCO3)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
White Quartz
Silicon Dioxide (SiO2)
mineral
Astrophyllite
(K,Na)3(Fe,Mn)7Ti2Si8O24(O,OH)7
mineral
Yellow Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
White Quartz
Silicon Dioxide (SiO2)
mineral