Sandstone
Arenite (SiO2 predominantly)
sedimentary
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Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Siltstone or fine-grained Sandstone)
Sedimentary Rock (Clastic)
sedimentary
Granite
Granite
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in Altered Host Rock
mineral
Lapis Lazuli
Lazurite-rich metamorphic rock (approx. (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Quartz Crystal (Amethyst)
Silicon Dioxide (SiO2)
mineral
Chert on Volcanic Host Rock
Sedimentary Chert (SiO2) within Basalt or Andesite
sedimentary
Granite
Granite (felsic intrusive igneous rock)
igneous
Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz Geode (Cracked Open)
Quartz (Silicon Dioxide - SiO2)
mineral
Breciated Limestone with Calcite Veins
Sedimentary Breccia (CaCO3)
sedimentary
Quartz (Iron-stained or Rose variant)
Silicon Dioxide (SiO2)
mineral
Turquoise in Matrix
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Peridotite
Peridotite (Ultramafic Rock)
igneous
Emerald in Matrix
Beryl (Be3Al2Si6O18)
mineral
Granite Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Carnelian Agate / Iron-Stained Quartz
SiO2
Mineral
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Granite Pebble (Weathered)
Phaneritic Felsic Igneous Rock
igneous
Granite
Granite (compositional mixture of Quartz, Feldspar, and Mica)
igneous
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Amygdaloidal Basalt with Quartz/Calcite Inclusions
Amygdaloidal Basalt (SiO2 / CaCO3 inclusions)
igneous
Boxwork Siderite or Sepatarian Nodule Weathering
Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment
sedimentary
Sandstone (with Iron Oxidation)
Arenite (SiO2 with Fe-oxides)
sedimentary
Sandstone (Ferruginous)
Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)
sedimentary
Labradorite
Labradorite (Ca, Na)(Al, Si)4O8
mineral
Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
sedimentary
Desert Rose
Gypsum (variety Selenite) or Barite, CaSO4·2H2O
mineral
Sandstone
Arenite
sedimentary
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Pyrite on Quartz matrix
Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Undetermined Due to Blur (Possible Flesh-Tone Mineral)
Unknown (Insufficient Visual Clarity)
Mineral
Dalmatian Jasper
Peralkaline Quartz-feldspathic Rock (Arfvedsonite-bearing)
igneous
Turquoise (Dyed Howlite/Magnesite)
CuAl6(PO4)4(OH)8·4H2O (Natural Turquoise) or Ca2B5SiO9(OH)5 (Howlite)
mineral
Vesicular Basalt
Vesicular Basalt (Aphanitic-Vesicular Mafic Rock)
igneous
Ferruginous Sandstone
Arenite with Iron-oxide cement
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral