Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
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Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Red Jasper
Microcrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
Blue Aventurine
Quartz (SiO2) with inclusions
mineral
Amber
Fossilized Tree Resin
gemstone
Sea Glass
Amorphous silicon dioxide (Man-made glass weathered by nature)
mineral
Black Onyx
Chalcedony (SiO2)
gemstone
Sea Glass
Man-made silicate glass (Amorphous silicon dioxide)
mineral
Opal
Hydrated amorphous silica, SiO2·nH2O
gemstone
Basalt Pebble
Extrusive Igneous Rock
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Red Coral
Corallium rubrum
gemstone
White Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Aventurine
Quartz with inclusion minerals (SiO2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Pink Granite
Felsic Intrusive Igneous Rock (Quartz, K-Feldspar, Plagioclase, Biotite)
igneous
Granite
Intrusive igneous rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Turtleback Rock (Brecciated Diabase / Granite)
Brecciated hypabyssal intrusive rock
igneous
Rose Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Pink Calcite
Calcium Carbonate (CaCO3)
mineral
Carnelian
Silicon dioxide (chalcedony variety), SiO2
gemstone
Green Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Hemimorphite
Hemimorphite (Zn4Si2O7(OH)2·H2O)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Lapis Lazuli
(Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2 (Complex silicate rock)
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Granite
Intrusive Igneous Rock
igneous
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