Pink Granite
Phaneritic intrusive igneous rock (Granite)
igneous
Category
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Blue Sapphire Crystal (Rough)
Corundum (Aluminum Oxide, Al2O3)
mineral
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz grains)
sedimentary
Granite
Granite (Phaneritic igneous rock)
igneous
Yellow Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Pink Granite
Phaneritic Igneous Rock (high K-Feldspar content)
igneous
Clear Quartz
Silicon dioxide (SiO2)
mineral
Hag Stone (Quartz Pebble with Natural Hole)
Quartz (Silicon Dioxide - SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Rock (composed primarily of Quartz, SiO2)
metamorphic
Beach Pebble (Basalt/Greywacke)
Amygdaloidal Basalt
igneous
Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)
sedimentary
Jasper in Quartz (River Cobble)
Silicon Dioxide (SiO2) with Ferric Iron inclusions
sedimentary
Beryl (Emerald variety in host rock)
Be3Al2(SiO3)6 (Silicate mineral)
mineral
Man-made Glass (Tumbled/Shaped)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Mineraloid (synthetic)
Sandstone (with Iron Staining)
Quartz Arenite / Ferruginous Sandstone
sedimentary
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2)
mineral
Sandstone (Banded)
Arenite (primarily SiO2)
sedimentary
Amethyst geode/druse
Quartz, SiO₂; purple variety amethyst
mineral
Diamond
Natural Diamond (Carbon, C)
gemstone
Tumbled jasper, likely red/brown jasper
Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides
metamorphic
Sandstone (Cross-bedded Drill Core)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Basalt (Water-worn Pebble)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Pumice
Pumice (volcanic glass with vesicular texture)
igneous
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Rhyolite or jasper-bearing volcanic rock
Rhyolite, likely altered and silicified; red coloration may come from hematite
igneous
Aura Quartz Geode
Titanium/Gold bonded Quartz (SiO2 with metallic coating)
mineral
Banded Chert
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Red Tiger's Eye
Silicified Crocidolite (Quartz pseudo-morph after Crocidolite), SiO2
metamorphic
Dyed Purple Agate
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Pink Granite (Water-worn Cobble)
Phaneritic Felsic Intrusive Igneous Rock
igneous
Granite
Phaneritic intrusive igneous rock (Granite)
igneous
Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Pegmatitic pink feldspar–quartz rock
Granitic pegmatite; chiefly microcline/orthoclase feldspar (KAlSi₃O₈), quartz (SiO₂), and minor mica
igneous
Limonite-coated Shale
Ferruginous Siliciclastic Shale
sedimentary
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Amethyst
SiO2 (Silicon Dioxide)
mineral
Amethyst
Silicon Dioxide (SiO2) with trace Iron impurities
mineral
Terrazzo flooring containing marble aggregate
Marble (recrystallized calcite, CaCO₃) aggregate in cementitious terrazzo
metamorphic