Igneous And Sedimentary Mixture

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Likely tumbled quartz or calcite pebble

Quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Chalcedony (Dyed Agate and Citrine-style Quartz)

Silicon Dioxide (SiO2)

Chert (Common Opal/Chalcedony mixture)

Silicon Dioxide (SiO2)

Iron Ore (Hematite/Magnetite mixture)

Ferrous Oxide (Fe2O3 / Fe3O4)

Chert (Common Opal/Agate mixture)

Microcrystalline Quartz (SiO2)

River Stone (Quartzite/Siltstone mixture)

Silicon Dioxide (SiO2) based metamorphosed sandstone

Quartz fragment

Quartz (silicon dioxide, SiO₂)

Specular Hematite

Hematite (Fe2O3)

Pyrite

Iron Disulfide (FeS2)

Tumbled quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Tumbled quartz (likely rose quartz or included quartz)

Quartz, silicon dioxide (SiO₂)

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Limonite (Ironstone)

Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))

Orange mineral fragment, possibly citrine or iron-stained quartz

Quartz (SiO₂), tentatively iron-included quartz/citrine

Epidote with Magnetite/Hematite inclusions

Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides

Pyrite

Iron Sulfide (FeS2)

Galena

Lead Sulfide (PbS)

Limonite (Iron Ore Congcretion)

Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)

Chalcedony (Moonstone variant or White Agate)

Silicon Dioxide (SiO₂)

Green Jasper (Agate-Jasper mixture)

Silicon Dioxide (SiO2) with impurities

River Rock (Quartz-dominated)

Silicon Dioxide (SiO2) mixture with varied clastic sediments

Quartz (milky quartz variety)

Quartz (SiO₂)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Quartz-rich rock or quartz specimen

Quartz (SiO₂), likely massive quartz or quartz-bearing host rock

Limonite (Iron Stone/Goethite)

Limonite (mixture of hydrated iron oxides, primarily Goethite: α-FeO(OH))

Copper-stained quartz/igneous rock specimen

Quartz (SiO₂), with secondary copper minerals; host likely altered volcanic rock

Natural quartz crystal (likely herkimer-style quartz)

Quartz, silicon dioxide (SiO₂)

Limonite (Iron Ore/Sandstone mixture)

Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix

Limonite (Yellow Ochre)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Likely raw garnet fragment

Garnet-group silicate, commonly almandine (Fe₃Al₂Si₃O₁₂)

Milky Quartz (Druzy Geode fragment)

Silicon Dioxide (SiO2)

Polished pale chalcedony or quartz pebble

Microcrystalline quartz, SiO₂; possibly milky quartz/chalcedony

Probable magnetite-bearing rock

Magnetite (Fe₃O₄), possibly in a fine-grained host rock

Weathered iron-rich rock (likely ironstone or limonite-bearing concretion)

Goethite–hematite–limonite mixture, commonly written FeO(OH) ± Fe₂O₃

Greywacke (likely)

Greywacke (a type of sandstone)

Limonite/goethite-rich ironstone concretion (probable)

Goethite–limonite, chiefly FeO(OH)·nH₂O, possibly with hematite and manganese oxides

Green Fluorite

Calcium Fluoride (CaF2)

Nuummite

Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)

Limonite / Goethite Ironstone

FeO(OH)·nH2O (Hydrous iron oxide)

Limonite (Iron Ore)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)