Vesicular Basalt / Scoria pebble
Extrusive igneous rock with amygdaloidal infilling
igneous
Category
Man Made Rock (Technosol)
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River Pebble
Polished Quartzite / Siliceous River Pebble
sedimentary
Fossilized Coral (Rugose or Tabulate) or Stromatolite
Phylum Cnidaria / Stromatolithus
fossil
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Moqui Marble
Hematite-Goethite Concretion
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite with Epidote Vein
Metamorphosed Quartz Sandstone with Hydrothermal Vein
metamorphic
Chert Pebble (with Quartz Vein)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 with various cementing minerals)
sedimentary
Dragon Blood Jasper
SiO2
mineral
Red Sandstone (with possible iron oxide staining)
Sandstone (primarily Quartz with Hematite/Goethite cement)
sedimentary
Tiger's Eye (Mineral Collection)
Tiger's Eye (SiO2 with crocidolite inclusions)
mineral
Moss Agate with Jasper
Chalcedony (SiO2 with inclusions)
mineral
Limestone (specifically Dolomitic/Crystalline Limestone)
Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)
sedimentary
Sandstone (Stream-rounded)
Arenite (SiO2 based)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Conglomerate
Conglomerate (Sedimentary Rock)
sedimentary
Porphyritic Igneous Pebble / Porphyry
Porphyritic Igneous Rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Basalt Pebble
Aphanitic Igneous Rock
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Granite
Intrusive igneous rock
igneous
Basalt Pebble (Shaped)
Extrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Basalt
Extrusive mafic rock
igneous
Quartz in Host Rock
Silicon Dioxide (SiO2) in Rhyolite or Granite matrix
igneous
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Quartz Vein in Host Rock (Pebble)
Quartz (SiO2) with sandstone or siltstone matrix
metamorphic/igneous transition
Basalt
Basalt (Mafic volcanic rock)
igneous
Diorite
Diorite (intermediate plutonic rock)
igneous
Jasper
Chalcedony (Microcrystalline Quartz) - SiO2
sedimentary or metamorphic
Sandstone (likely Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Granite River Rock
Phaneritic Felsic Igneous Rock (Granite)
igneous