River Pebble (Basalt or fine-grained Quartzite)
Fine-grained Mafic Rock (Volcanic Basalt)
igneous
Category
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Hag Stone
Perforated Flint or Chert (SiO2)
sedimentary
Granite Boulder
Felsic Intrusive Igneous Rock
igneous
Polished Stone Pendant (Identity Unclear)
Unknown (Possibly Jasper/Agate/Quartz mixture)
mineral
Limonite (Iron Ore)
Hydrated ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Banded Iron Formation (BIF) / Tiger Iron variety
Banded Iron Formation (composed primarily of Magnetite Fe3O4, Hematite Fe2O3, and Chert/Quartz SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Weathered iron-rich sandstone or laterite
Ferruginous sandstone; potentially lateritic ironstone, composed mainly of quartz (SiO₂) with iron oxides/hydroxides
sedimentary
Scoria
Highly vesicular mafic volcanic rock
igneous
Yellow tumbled/rough chalcedony, possibly citrine or dyed agate
Chalcedony (microcrystalline SiO₂), with yellow coloration likely from iron oxides; exact identification is uncertain from the photograph
mineral
Granitic Pegmatite
Coarse-grained Igneous Rock (Granitic composition: KAlSi3O8, SiO2)
igneous
Shale
Shale (Lutite)
sedimentary
Olivine (Peridot)
Olivine (Magnesium Iron Silicate, (Mg,Fe)2SiO4)
mineral
Calcite crystal cluster
Calcite (calcium carbonate, CaCO₃), likely honey or pale-orange calcite
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Ironstone (Limonite/Goethite Concretion)
Ferruginous Sedimentary Rock (composed of Goethite FeO(OH) and Limonite)
sedimentary
Vesicular Basalt
Extrusive mafic igneous rock
igneous
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Weathered sandstone or iron-stained sedimentary stone
Quartz-rich sandstone, commonly arkose or lithic sandstone; composition cannot be confirmed visually
sedimentary
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Mineral
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Aquamarine with Quartz
Beryl (Be3Al2Si6O18) with Quartz (SiO2)
mineral
Ruby
Corundum (Al2O3 with Chromium trace)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Jasper
Jasper (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Quartz Vein in Host Rock (Gabbro or Basalt)
Silicon Dioxide (SiO2) with Mafic Silicates
metamorphic/igneous
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Weathered limestone
Calcitic limestone, mainly calcium carbonate (CaCO₃)
sedimentary
Blue-green raw mineral specimen, likely apatite
Fluorapatite, Ca₅(PO₄)₃F (probable; visual identification only)
mineral
Tumbled serpentine with dark magnetite/chromite matrix
Serpentinite; chiefly antigorite/lizardite, Mg3Si2O5(OH)4, with magnetite and possibly chromite
metamorphic
Serpentine pendant
Serpentinite; chiefly antigorite, lizardite, or chrysotile Mg₃Si₂O₅(OH)₄
metamorphic
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Banded Agate (specifically Gobi Eyes or Eye Agate)
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Chert (often called Flint)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Banded Amethyst (Chevron Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Tumbled pink-and-white quartz
Quartz, silicon dioxide (SiO₂), likely rose quartz mixed with milky quartz
mineral
River Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Native Copper
Native Copper (Cu)
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))
metamorphic
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic