Tumbled jasper or quartzite pebble
Jasper (microcrystalline quartz, SiO₂), possibly iron-stained quartzite
metamorphic
Category
Man Made Material
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Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Quartz-rich rock, possibly milky quartz or quartzite
Quartz (silicon dioxide, SiO₂); if granular and foliated, likely quartzite
mineral
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Tumbled green-and-white stone, likely serpentine
Serpentinite; mainly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnesite or talc
metamorphic
Quartz / Chalcedony
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Chert Nodule (with Flint core)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Polished brown jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
metamorphic
Tumbled chalcedony (likely brown agate/jasper)
Microcrystalline quartz, SiO₂; potentially iron-stained chalcedony or jasper
mineral
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
sedimentary
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chondrite Meteorite
L or H Ordinary Chondrite
meteorite
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Tumbled yellow calcite
Calcite (calcium carbonate, CaCO₃)
mineral
Greenstone, likely serpentine or green jasper
Serpentine-group minerals, chiefly antigorite/lizardite; possibly quartz-rich jasper
metamorphic
Jasper (Multi-color Chert)
Silicon Dioxide (SiO2) with impurities
sedimentary
Milky quartz (likely quartzite or massive quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Tumbled pale quartz/chalcedony fragment
Quartz (SiO₂), possibly microcrystalline chalcedony
mineral
Red Sandstone
Arenite (with Iron Oxide / Hematite staining)
sedimentary
Tumbled greenish serpentine
Serpentinite; chiefly antigorite/lizardite, Mg₃Si₂O₅(OH)₄
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Scoria
Vesicular Basaltic Glass
igneous
Black-and-white jasper
Jasper, microcrystalline quartz (SiO₂), with contrasting white mineral inclusions
metamorphic
Chert (Holey Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Flint (or Chert)
Microcrystalline quartz (SiO2)
sedimentary
Limestone Cobble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartz cluster, possibly druzy quartz on matrix
Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain
mineral
Likely tumbled jasper or iron-stained quartzite
Microcrystalline quartz (SiO₂), possibly quartzite with iron-oxide inclusions
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz-lined vesicle in basalt (amygdaloidal basalt)
Amygdaloidal basalt with drusy quartz; predominantly plagioclase, pyroxene, and iron oxides
igneous
Scoria
Scoria (Vesicular Basaltic Rock)
igneous
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Tumbled rhodonite
Rhodonite, manganese inosilicate (MnSiO₃), commonly mixed with quartz and manganese oxides
metamorphic
Tumbled brown jasper (likely iron-rich chalcedony)
Jasper, opaque microcrystalline quartz (SiO₂), commonly colored by iron oxides
mineral
Limestone
Calcium carbonate (CaCO3)
sedimentary
Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (general term for sandstone)
Sedimentary Rock