Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Category
Not A Rock
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Fish Fossil in Limestone
Lycoptera (likely) in Micritic Limestone
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Vesicular Basalt with Epidote
Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Scoria
Scoria (Vesicular Basalt/Andesite)
igneous
Shale
Shale (claystone/mudstone)
sedimentary
Mudstone
Argillite
sedimentary
Ferrous Slag (Iron Smelting By-product)
Fused Siliceous Slag
Anthropogenic Material (Man-made Rock)
Sandstone (Painted)
Arenite (primarily SiO2)
sedimentary
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Gneiss (Pebble)
Gneiss
metamorphic
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Chert (Yellow/Tan Variety)
Chert (SiO2)
sedimentary
Serpentine (Serpentinite)
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Vesicular Basalt
Extrusive mafic igneous rock
igneous
Grey Limestone Pebble
Limestone (Calcium Carbonate - CaCO3)
sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Slate with Quartz Vein
Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)
metamorphic
Unknown Rock Specimen
igneous
Eroded Brick or Pumice-like Scoria
Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)
igneous
Sandstone
Sandstone (clastic sedimentary rock)
Rock
Granodiorite or Diorite
Granodiorite / Diorite
igneous
Shale
Fissile mudrock (composed of clay-sized particles and detrital grains)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Yellow Quartzite (River Pebble)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Greywacke (likely)
Greywacke (a type of sandstone)
Sedimentary
Shale
Shale (clastic sedimentary rock composed of silt and clay-sized particles)
sedimentary
Dalmatian Jasper / Dalmatian Stone
Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)
igneous
Shale
Fissile mudstone (Shale)
sedimentary
Basalt
Aphanitic Mafic Igneous Rock
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
metamorphic
Sandstone (Ferruginous)
Arenite with Iron Oxide (Limonite/Hematite) coating
sedimentary
Coquina / Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
Sedimentary
Quartz with inclusions (likely Chlorite or Hornblende) and country rock
SiO2 (Quartz) with associated ferromagnesian minerals
Mineral/Igneous/Metamorphic association
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Quartz Crystal Cluster on Matrix
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral