Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Category
Not A Rock Or Mineral
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Chalcedony (Agate/Carnelian)
Silicon Dioxide (SiO2)
mineral
Concretion
Sedimentary Concretion (Ironstone / Calcite Concretion)
sedimentary
Fluorite (Rainbow or Multi-colored Fluorite)
Fluorite (Calcium Fluoride - CaF2)
mineral
Red Sandstone
Arenite (predominantly Quartz with Hematite cementation)
sedimentary
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Fluorite on Matrix
Calcium Fluoride (CaF2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Herkimer Diamond in Matrix
Quartz (SiO2) in Dolostone (CaMg(CO3)2)
sedimentary (host) / mineral (crystals)
Granite
Granite
igneous
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Greenstone
Metabasalt / Metavolcanic rock
metamorphic
Schist with Quartz Vein
Mica Schist with Crystalline Quartz (SiO2)
metamorphic
Fossilized Shell
Invertebrate fossil (Bivalvia or Brachiopoda)
fossil
Quartz (Smoky/Druzy variety)
Silicon Dioxide (SiO2)
mineral
Weathered mafic rock, likely basalt
Basalt; primarily plagioclase feldspar, clinopyroxene, and commonly olivine or magnetite
igneous
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Sandstone with Dendritic Manganese Oxides
Sandstone (SiO2 predominant) with Oxide Dendrites (MnO2)
sedimentary
Granite Cobble
Granite (Porphyritic/Coarse-grained)
igneous
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Geode (Unopened)
Siliceous Concretion / Geode
sedimentary
Raw Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Quartz (Tumbled/Water-worn)
Silicon Dioxide (SiO2)
mineral
Peridotite / Olivine-rich Xenolith
Ultramafic igneous rock (predominantly olivine and pyroxene)
igneous
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with iron and other mineral inclusions
mineral
Painted Sandstone Cobble
Clastic Sedimentary Rock (Sandstone base)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Massive Quartz
Silicon dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Quartz Druzy on Matrix
Silicon Dioxide (SiO2)
mineral
Sulfide Ore (likely Galena and Sphalerite in Quartz)
Lead-Zinc Ore (PbS and ZnS)
mineral
Limonite Geode (Ironstone Concretion)
Goethite/Limonite FeO(OH)·nH2O
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Serpentinite
Serpentinite (Hydrated magnesium iron phyllosilicate)
metamorphic
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz (likely Herkimer Diamond style)
Silicon Dioxide (SiO2)
mineral
Quartz-veined Sandstone Pebble
Quartzose Sandstone with Quartz Veinlets
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Pebble/Conglomerate fragment)
Sandstone (clastic sedimentary rock)
Sedimentary Rock
Dyed Agate / Quartz (Tumbled)
Silicon Dioxide (SiO2) with artificial dye
mineral
Sandstone Pebble
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary