Polished orbicular jasper (likely ocean jasper)
Jasper, a microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions
mineral
Category
Mineral (Pseudomorph)
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Serafina (Serafinite / Clinochlore)
Clinochlore (Mg5Al)(AlSi3O10)(OH)8
mineral
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Sandstone (Fluvial Pebble)
Arenite
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Red Sandstone
Clastic Terrigenous Sedimentary Rock (composed mostly of SiO2 with Fe2O3)
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Azurite
Azurite (Cu3(CO3)2(OH)2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Hematite
Iron (III) Oxide (Fe2O3)
mineral
Glacial Cobbles (predominantly Granite and Gneiss)
Mixed lithologies (Quartz, Feldspar, Mica assemblage)
igneous and metamorphic
Banded Sandstone (River Pebble)
Clastic Sedimentary Rock (SiO2 with impurities)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Ruby / Red Tourmaline
Corundum (Al2O3) or Elbaite (Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)4)
mineral
Microcline Feldspar
KAlSi3O8
mineral
Sphalerite
Zinc Sulfide (ZnS)
mineral
Amazonite
Microcline Feldspar (KAlSi3O8)
mineral
Beryl (likely Aquamarine or Heliodor variant)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Sodalite
Sodalite Na8(Al6Si6O24)Cl2
mineral
Quartz Geode
Crystalline Silver Oxide (SiO2) in Calcareous Host
mineral
Peacock Ore (Bornite or Chalcopyrite)
Bornite (Cu₅FeS₄) or iridescent Chalcopyrite (CuFeS₂)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Milky Quartz with Chlorite/Epidote inclusions
Silicon Dioxide (SiO2) with phyllosilicate/sorosilicate inclusions
mineral
Sandstone
Sandstone (Silicon Dioxide, SiO2)
sedimentary
Sandstone
Sedimentary rock composed mainly of sand-sized minerals or rock grains
sedimentary
Rough Apatite in Matrix
Fluorapatite / Chlorapatite / Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Pyrite (Fools Gold)
Iron Disulfide (FeS2)
mineral
Calcite on Matrix
Calcium Carbonate (CaCO3)
mineral
Sandstone
Sandstone (SiO2 dominant, with minor feldspar and clay minerals)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Garnet (Almandine/Pyrope series)
Silicate mineral (Almandine: Fe3Al2Si3O12; Pyrope: Mg3Al2Si3O12)
mineral
Quartz Chip
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic Glass with Spherulitic Cristobalite (SiO2)
igneous
Chalcedony (Agate / Moss Agate)
Silicon Dioxide (SiO2)
mineral
Quartzite with Epidote Vein
Metamorphosed Quartz Sandstone with Hydrothermal Vein
metamorphic
Weathered iron-rich rock, possibly laterite or limonite-bearing stone
Hydrated iron oxides/hydroxides, chiefly limonite-goethite mixture; exact identification requires testing
mineral