Granodiorite
Granodiorite (containing Plagioclase, Quartz, and K-feldspar)
igneous
Category
Minerals
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Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Kidney Stone
Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)
mineral
Greenschist / Migmatite
Regional Metamorphic Complex (Facies: Greenschist to Amphibolite)
metamorphic
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Pyrite in Quartz
FeS2 (Iron Pyrite) with SiO2 (Quartz)
Mineral/Igneous/Hydrothermal
River Cobble (likely Basalt or Greenstone)
Mafic Igneous Rock (with possible chloritic alteration)
igneous
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
sedimentary
Basalt with Epidote/Chlorite
Amygdaloidal Basalt (SiO2 with (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)))
igneous
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Granite
Granite (a common term for a felsic intrusive igneous rock)
igneous
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Granite Gneiss
Gneiss (High-grade regional metamorphic rock)
Metamorphic
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
Mineral
Prehnite
Prehnite, Ca2Al(AlSi3O10)(OH)2
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss (specifically a Banded Gneiss pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Basalt-Amugydule (Amygdaloidal Basalt)
Aphanitic Mafic Igneous Rock with Vesicle Infillings
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Greenstone
Greenschist (containing chlorite, epidote, and actinolite)
metamorphic
Basalt (Greenstone)
Basalt with chlorite/epidote (often referred to as Greenstone)
igneous
Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone or Limonite (FeO(OH)·nH2O)
sedimentary
Gossan (with Limonite/Hematite coating)
Ferruginous Gossan (Fe2O3·nH2O / Fe2O3)
sedimentary
Serpentinite
Serpentinite
metamorphic
Olivine in Basalt matrix
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
igneous
Basalt
Basalt
Igneous
Magnetic Sand Grain / Magnetite Pellet
Magnetite (Fe3O4)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Epidote with quartz/feldspar
Epidote, Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Quartz with Mineral Inclusions
Silicon Dioxide (SiO2) with accessory minerals
mineral
Agate
Agate (Chalcedony), SiO2
Mineral
Gneiss
Gneiss (pronounced 'nice')
Metamorphic Rock
Gneissic Schist
Gneiss-schist (Metamorphic rock)
metamorphic
Basalt
Basalt
igneous
Jadeite
NaAlSi2O6; Jadeite silicate mineral
metamorphic
Serpentine
Antigorite/Lizardite (Mg, Fe)3Si2O5(OH)4
metamorphic
Synthetic Wolf Plush (Non-mineral)
Canis lupus similis (Prop material: Polyester & Synthetic fibers)
Synthetic material/Textile
Granite
Granite (Phaneritic Igneous Rock)
igneous
Granodiorite / Granite (Weathered)
Granodiorite
Igneous