Siltstone or Mudstone
Argillaceous sedimentary rock
sedimentary
Category
Not A Rock (Man Made Polymer)
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Ironstone (Limonitic Concretion)
Limonite (FeO(OH)·nH2O) with Goethite and Hematite inclusions
sedimentary
Painted River Rock
Polished fluvial clast with acrylic/synthetic pigment coating
Sedimentary or Metamorphic (base substrate)
Granite (Specimen: Logan Rock)
Phaneritic plutonic igneous rock (mainly Quartz, Feldspar, and Mica)
igneous
Fine-grained dark igneous rock, likely basalt
Basalt; predominantly plagioclase feldspar and pyroxene, commonly with minor olivine and iron-titanium oxides
igneous
Fenestella Bryozoan Fossil
Fenestella (class Stenolaemata)
fossil
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Graphic Granite (or Rapakivi-textured Granite)
Alkali feldspar granite
igneous
Sandstone (Garden Boulder)
Sandstone (SiO2 dominated)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
mineral
Limestone (specifically Dolomitic/Crystalline Limestone)
Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Apache Tear
Obsidian (Volcanic Glass)
igneous
Quartz Vein in Basalt or Sedimentary Host Rock
Silica-veined lithic fragment (SiO2 in host matrix)
sedimentary
Agated Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz pebble (Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (plutonic felsic rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Beach Agate / Jasper Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz fragment (Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble with Drusy/Crystalline Pocket
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion (Moqui Marble / Boji Stone)
Sedimentary Iron Oxide Concretion (Fe2O3 / FeO(OH))
sedimentary
Vesicular Basalt / Scoria pebble
Extrusive igneous rock with amygdaloidal infilling
igneous
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
Conglomerate
Conglomerate (Sedimentary Rock)
sedimentary