Pink Granite
Phaneritic intrusive igneous rock (Granite)
igneous
Category
Synthetic (Not A Natural Rock)
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Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Hag Stone
Perforated Sedimentary Rock (typically Sandstone or Siltstone)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminium phosphate)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid
River Cobble (likely Basalt or Greenstone)
Mafic Igneous Rock (with possible chloritic alteration)
igneous
Pegmatitic pink feldspar–quartz rock
Granitic pegmatite; chiefly microcline/orthoclase feldspar (KAlSi₃O₈), quartz (SiO₂), and minor mica
igneous
Rounded granite cobble
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Pink Dyed Agate (Pink Agate Slice)
Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz
mineral
Chert (Field Stone)
Silicon Dioxide (SiO2)
sedimentary
Weathered granite or granitic gneiss
Granite: quartz, feldspar, and mica; possibly weakly foliated gneiss
igneous
Blue Chalcedony (Tumbled)
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Slate
Low-grade Metamorphic Rock (composed of quartz, illite, chlorite)
metamorphic
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Likely quartz fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock
mineral
Limonite-coated Shale
Ferruginous Siliciclastic Shale
sedimentary
Polished carnelian-rich agate (likely polyhedral jasper/chalcedony)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Granite
Granite (Phaneritic Acidic Igneous Rock)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Rhyolite or jasper-bearing volcanic rock
Rhyolite, likely altered and silicified; red coloration may come from hematite
igneous
Quartz Vein with Iron Staining
Silicon Dioxide (SiO2) with limonite/hematite staining
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Serpentine-rich serpentinite pebble
Serpentinite, composed chiefly of serpentine-group minerals (lizardite, antigorite, chrysotile), commonly with magnetite and minor brucite
metamorphic
Asphalt
Asphalt concrete
sedimentary
Druzy Quartz Geode (likely Smokey Quartz variety)
Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.
Mineral structure/Rock
Rounded river pebble
Indeterminate; likely quartz-rich sandstone, chert, or weathered volcanic rock
sedimentary
Peridotite (Dunite/Peridot Xenolith)
Peridotite (predominantly Olivine (Mg, Fe)2SiO4)
igneous
Pumice
Pumice (Amorphous volcanic glass)
igneous
Polished orange agate/jasper cabochon
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide coloration; exact variety uncertain
mineral
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz grains)
sedimentary
Rough Corundum (likely Sapphire/Zircon-bearing)
Aluminium Oxide (Al2O3)
mineral
Greywacke (River Siltstone)
Lithic Wacke (Sandstone subfamily)
sedimentary
Sandstone (Wonderstone)
Silicified Sandstone / Orthoquartzite with Liesegang rings
sedimentary
Water-worn basalt cobble
Basalt; chiefly plagioclase feldspar, pyroxene, and minor olivine/iron oxides
igneous
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Conglomerate
Clastic sedimentary rock (Polymict conglomerate with quartz/calcite matrix)
sedimentary
Green Aventurine
Silicon Dioxide (Quartz variety) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral