Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Category
Sedimentary (Chemically Precipitated Mineral)
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Tumbled milky quartz pebble
Quartz, silicon dioxide (SiO₂), microcrystalline to coarsely crystalline variety
mineral
White calcite fragment (likely limestone or marble)
Calcite, calcium carbonate (CaCO₃); exact host rock is uncertain from the image
mineral
Banded iron formation fragment
Banded iron formation (BIF), chiefly hematite/magnetite and chert (SiO₂)
sedimentary
Chert / Flint (with Crinoid Stem Molds)
Microcrystalline Quartz (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Crystalline Quartz (Rough)
Quartz (Silicon Dioxide, SiO2)
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Milky quartz pebble
Quartz, silicon dioxide (SiO₂)
mineral
Fossilized Limestone with Crinoid Stem
Carboniferous Limestone (containing Crinoidea ossicles)
fossil
Agate Sliced Nodule
Silicon Dioxide (SiO2)
mineral
Malachite
Copper(II) carbonate hydroxide, Cu2CO3(OH)2
mineral
Quartz with Sericite and Cinnabar
Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)
mineral
Banded Iron Formation (BIF) / Ironstone
Magnetite-Hematite Quartzite / Ironstone
sedimentary
Limestone (or Calcite Nodules)
Calcium Carbonate (CaCO3)
sedimentary
Banded Flint (Chert)
Silicon Dioxide (SiO2)
sedimentary
Howlite
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Weathered stone, likely sandstone or altered volcanic rock
Indeterminate; possibly quartz-rich sandstone or weathered tuff
sedimentary
Likely serpentinite (serpentine-rich rock)
Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite, lizardite, or chrysotile)
metamorphic
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Gold
Native Gold (Au)
mineral
Chert (with Quartz veins)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon dioxide (SiO2)
mineral
Weathered limestone pebble
Limestone; predominantly calcite (CaCO₃)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Quartz (Milky or Clear fragment)
Silicon Dioxide (SiO2)
mineral
Raw pink chalcedony (likely pink agate/jasper)
Microcrystalline quartz, SiO₂ (chalcedony); impurities may include iron oxides and other silicates
mineral
Chert (with Calcite layering)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
sedimentary
Tumbled milky quartz pebble
Quartz, silicon dioxide (SiO₂)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Geodic Cavity
sedimentary
Ferruginous Sandstone
Arenite with limonite/goethite cement
sedimentary
Microcrystalline Limestone
Limestone (CaCO3 with impurities)
sedimentary
Satin Spar (Gypsum)
Hydrous Calcium Sulfate (CaSO4·2H2O)
mineral
Jasper with Hematite
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
sedimentary
Weathered iron-rich concretion or laterite fragment
Ferruginous concretion, likely goethite/limonite (hydrated iron oxides) in a clay-rich matrix
sedimentary
Milky quartz
Quartz (silicon dioxide, SiO₂), likely a massive vein-quartz specimen
mineral
Limonite / Iron Oxide Concretion
FeO(OH)·nH2O (Hydrated iron oxide)
mineral
Milky calcite
Calcite (CaCO₃), likely a cleavage fragment
mineral
Tumbled milky quartz (likely quartz/chalcedony)
Quartz, SiO₂; possibly microcrystalline chalcedony
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (containing Calcite or Quartz inclusions)
Silicon Dioxide (SiO2) with varying mineral impurities
sedimentary