Quartz-veined Basalt
Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein
igneous
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Pink Granite
Granitoid (rich in Potassium Feldspar)
igneous
Bivalve Seashell Fossil
Class Bivalvia
fossil
Quartz Vein Rock
Quartz (Silicon Dioxide, SiO2)
igneous
Pink Granite
Phaneritic Igneous Rock (Quartz-Feldspar-Mica)
igneous
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Shale
Fissile mudrock (composed of clay-sized particles and detrital grains)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Coal (Bituminous / Anthracite)
Organic Sedimentary Rock (Carbonaceous Rock)
sedimentary
Basalt
Basalt
igneous
Vesicular Basalt with Epidote
Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
igneous
Shale
Shale (claystone/mudstone)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Basalt cobble
Basalt; predominantly plagioclase, clinopyroxene, and often olivine or iron-titanium oxides
igneous
Coal
Bituminous or sub-bituminous coal (carbonaceous rock)
sedimentary
Fossiliferous Limestone
Bioclastic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Gabbro (or Basalt Pebble)
Mafic Intrusive/Extrusive Igneous Rock
igneous
Basalt
Basalt
igneous
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Sandstone (Glacial Cobble)
Arenite / Sedimentary Rock (primarily SiO2)
sedimentary
Quartzite Cobble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartz Geode
Silicon dioxide (SiO2)
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Ulexite
NaCaB5O6(OH)6·5H2O
mineral
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
Basalt
Aphanitic Mafic Igneous Rock
igneous
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron Oxide (Limonite/Hematite) coating
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Fish Fossil in Limestone
Lycoptera (likely) in Micritic Limestone
sedimentary
Shale or Slate with Quartz Veins
Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins
Metamorphic, likely Sedimentary with Quartz veins
Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Pink Granite
Phaneritic Felsic Igneous Rock (Granite, rich in Potassium Feldspar)
igneous
Basalt with Quartz Veins
Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions
igneous
Red jasper in gray host rock (likely hematite-stained quartzite or rhyolite)
Jasper: microcrystalline quartz (SiO₂), with iron-oxide coloration; exact host uncertain from image
mineral
Sandstone
Sandstone (clastic sedimentary rock)
Rock
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
mineral