Serpentine
Serpentinite (rock) containing serpentine minerals (e.g., Antigorite, Lizardite, Chrysotile)
Metamorphic rock
Category
Mineral (Biogenic)
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Gneiss
Gneiss
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Concretion
Various mineral compositions, typically carbonate or iron oxide cemented sediment
Sedimentary
Porphyritic Basalt
Porphyritic Basalt with Olivine phenocrysts
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2)
igneous
Gneiss with Quartz Veining
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Diorite (Salt and Pepper Rock)
Diorite
igneous
Granite Pebble
Intrusive Felsic Igneous Rock (Granite)
igneous
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Diorite
Intrusive Igneous Diorite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Granite
Intrusive igneous felsic rock
igneous
Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Amygdaloidal Basalt with Agate/Chalcedony Infills
Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)
igneous
Epidote
Epidote - Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Banded Gneiss and Siltstone River Stones
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Granite Cobble (River Stone)
Felsic intrusive igneous rock (composition: Quartz, Feldspar, Mica)
igneous
Wishing Stone (Basalt or Mudstone with Quartz/Calcite Veins)
Hydrothermally veined Basalt (SiO2/CaCO3 intrusions)
igneous or sedimentary
Red Jade (Dyed Quartzite)
Silicon Dioxide (SiO2) - variety Quartzite
metamorphic
Granite
Granite (Alkali-feldspar granite)
igneous
Pink Granite
Granite (Phaneritic igneous rock rich in Alkali Feldspar and Quartz)
igneous
Granite
Plutonic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Granite
Granite
igneous
Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)
Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)
Synthetic (Ceramic)
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Pink Granite
Granite (Alkali-feldspar granite)
igneous
Granite
Phaneritic Plutonic Igneous Rock (Rich in SiO2)
igneous
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Granite
Plutonic felsic igneous rock
igneous
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Mica Schist
Muscovite/Biotite Schist
metamorphic
Pink Granite
Granite (Phaneritic Igneous Rock)
igneous
Pink Granite
Granite (Felsic intrusive igneous rock)
igneous
Granite
Phaneritic plutonic rock (approx. 20-60% quartz, 35-90% feldspar)
igneous
Yellow Jasper
SiO2 (Silicon Dioxide)
sedimentary