Quartzite
Quartzite (SiO2)
metamorphic
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Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (Metamorphic Rock)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Red Granite
Felsic Intrusive Igneous Rock
igneous
Geode
Quartz nodule / Chalcedony-lined cavity
sedimentary
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Granite
Intrusive Igneous Rock
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral
Wishing Stone / Banded Quartz Vein Pebble
Sedimentary pebble with hydrothermal quartz veins (SiO2)
sedimentary
Chert
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Fulgurite
Fulgurite (Lechatelierite or fused sand/quartz)
mineral
Chert / Flint
Silicon dioxide (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Aphanitic Igneous Rock
igneous
Basalt
Extrusive igneous rock
igneous
Chert
Microcrystalline quartz (SiO2)
sedimentary
Green Quartzite
Metamorphic Quartzite (often colored by chromium-bearing minerals or fuchsite)
metamorphic
Banded Gneiss
Gneiss
metamorphic
Limestone Pebble
Sedimentary carbonate rock (CaCO3)
sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Peach Quartz
Silicon Dioxide (SiO2)
mineral
Pink Quartz / Rose Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartz Arenite
metamorphic
Quartz (Pink / Rose Quartz variant)
Silicon Dioxide (SiO2)
mineral
Mixed River Pebbles (including Unakite and Jasper)
Polymineralic geological specimens
igneous and sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Jasper with Quartz Veining
Microcrystalline quartz (SiO2) with iron oxide impurities
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized rugose coral)
fossil
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone