Tumbled Mixed Gemstones and Rocks
Various mineral species including quartz (SiO2) and silicate minerals
mineral
Category
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Ironstone / Hematite Concretion
Iron oxide / Fe2O3
sedimentary
Conglomerate
Polymictic Conglomerate
sedimentary
Ferruginous Sandstone Pebble
Iron-rich Clastic Sedimentary Rock
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Basalt Pebble
Extrusive mafic igneous rock
igneous
Dyed Fuchsia Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Basalt Xenolith in Matrix
Basaltic Mafic Xenolith / Ultra-mafic Inclusion
igneous
Fossilized tooth or tooth fragment
Indeterminate vertebrate tooth; likely mammalian, mineralized hydroxyapatite
fossil
Granite Boulder
Felsic Intrusive Igneous Rock
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert Nodule / Ironstone Concretion
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Blue Dyed Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Smoky Quartz (with possible Garnet inclusions)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Limonite (Ochreous Sandstone)
Hydrous ferric oxides (FeO(OH)qnH2O)
sedimentary
Sapphire
Corundum (Al2O3)
gemstone
Coquina
Biogenic Limestone (CaCO3)
sedimentary
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Collection of Minerals and Ores
Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)
mineral
Fossiliferous Limestone
Calcareous biomicrite / Bioclastic limestone
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Mixed river-worn rock and mineral collection
Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble
igneous, sedimentary, metamorphic, mineral
Sandstone Pebble
Sandstone (Siliciclastic Sedimentary Rock)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities
mineral
Opalite
Man-made Glass (SiO2 + additives)
mineraloid (synthetic)
Tufa Rock and Tumbled Gemstones
Calcareous Tufa (Calcium Carbonate, CaCO3)
sedimentary
Shale (possibly Carbonaceous or Oil Shale)
Laminated Mudstone (primarily clay minerals and quartz)
sedimentary
Painted River Rock
Artificially Coated Sedimentary Rock
sedimentary
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
Sandstone (with Iron Staining)
Sandstone (mainly Quartz, SiO2, with Iron Oxides like Goethite/Hematite)
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Granite (Weathered)
Plutonic Igneous Rock (Granitic)
igneous
Sandstone
Arenite (clastic sedimentary rock)
sedimentary