Quartzite
Quartzite (primarily SiO2)
metamorphic
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Quartzite
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Chert (varieties: Flint, Jasper)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Quartzite pebble
Quartzite (SiO2)
metamorphic
Orange Quartzite
Quartzite (primarily SiO2)
metamorphic
Dyed Pumice
Vesicular Rhyolite (Artificial Coloration Addition)
igneous
Dalmation Stone
Peralkaline Rock (mixed silicate minerals)
igneous
Tektite (likely Indochinite)
Tektite (high-silica impact glass)
igneous
Obsidian
Obsidian (Volcanic Glass) SiO2 (70% or more)
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Schist
Schist
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartzite (Pink/Red variety)
Quartzite (SiO2 with iron oxide impurities)
metamorphic
Desert Rose (also known as Sand Rose)
Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions
mineral
Cordierite in Matrix (Iolite)
Magnesium iron aluminium cyclosilicate (Mg,Fe)2Al4Si5O18
metamorphic
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Flint (Chert)
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Fluorite (Green)
Calcium Fluoride (CaF2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Fluorite Tower
Fluorite (Calcium Fluoride - CaF2)
mineral
Fluorite (Rainbow Fluorite Point)
Calcium Fluoride (CaF2)
mineral
Yellow Quartzite (River Cobble)
Quartzite (mainly SiO2)
metamorphic
Jasper
Jasper (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Geode (unopened) or Calcareous Nodule
Siliceous or Calcareous Concretion/Nodule
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Unakite / Epidosite
Epidote with Orthoclase and Quartz; (Ca2(Al2,Fe)(SiO4)3(OH)) / (KAlSi3O8) / (SiO2)
metamorphic
Red Jasper
Jasper (Silicon Dioxide) - SiO2
sedimentary
Calcite Geode
Calcium Carbonate (CaCO3)
mineral
Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate)
Chalcedony (Cryptocrystalline Quartz, SiO2)
mineral
Ruby
Corundum (Al2O3 with chromium impurities)
mineral
Stream-Rounded Shale or Mudstone
Argillaceous sedimentary rock
sedimentary
Piddock bored rock (Boring Stone)
Ichnofossil-bearing Limestone or Mudstone (trace fossils by Pholadidae)
sedimentary
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Granite (Weathered)
Phaneritic Felsic Igneous Rock
Igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral