Sedimentary And Igneous (Mixed)

Red jasper chips

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Ironstone Concretion (Limonite/Hematite Nodules)

Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)

Likely assorted beach/river pebbles

Undetermined mixed lithologies; visible pieces may include quartz-rich and volcanic rocks

Pyrite

Iron Sulfide (FeS2)

Specular Hematite with Quartz and Limonite

Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)

Honey-colored quartz cluster

Quartz, silicon dioxide (SiO₂), likely iron-stained or included quartz

Blue sodalite (likely rough fragments)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly mixed with blue calcite or lapis lazuli

Quartz

Silicon Dioxide (SiO2)

Jasper Pendant

Silicon dioxide (SiO2) with impurities

Quartz Geode

Silicon Dioxide (SiO2)

Pyrite in Quartzite/Graphite Matrix

Iron Sulfide (FeS2)

Uncertain dark-and-white rock fragment

Likely a mixed lithic specimen, possibly quartz-bearing granite or ore; exact identification is not possible from the photograph

Pyrite in Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Geode

Silicon dioxide (Quartz/Chalcedony) concretion

Likely limonite/goethite-rich ironstone

Limonite (amorphous hydrated iron oxides), commonly mixed with goethite, hematite, and host rock

Orange Calcite

Calcium Carbonate (CaCO3)

Polished hematite bead (probable)

Hematite, Fe₂O₃

Polished red jasper

Jasper, microcrystalline quartz (SiO₂), colored by iron oxides and commonly mixed with chalcedony or other minerals

Pyrite-bearing rock (likely pyrite-rich schist or massive pyrite)

Pyrite, FeS₂, possibly in a micaceous metamorphic matrix

Orange Quartz (or Carnelian Chalcedony)

Silicon Dioxide (SiO2)

Milky quartz-bearing rock, possibly quartzite

Quartz (SiO₂), likely in a quartzite or quartz-rich vein

Yellow Calcite

Calcium Carbonate, CaCO3

Yellow-orange quartz/chalcedony pebble (possibly citrine-bearing)

Quartz, SiO₂; likely microcrystalline chalcedony with iron staining

Rhodonite

Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix

Jasper

Silicon Dioxide (Microcrystalline Quartz)

Jasper in Calcite / Brecciated Jasper

Silicon dioxide with calcium carbonate (SiO2 with CaCO3)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Black Tourmaline (Schorl)

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Milky Quartz

Silicon Dioxide (SiO2)

Black Onyx

Chalcedony (SiO2)

Clear Quartz

Silicon dioxide (SiO2)

Calcite

Calcium Carbonate (CaCO3)

Iceland Spar (Optical Calcite)

Calcite (CaCO3)

Quartz Geode with Calcite/Siderite

Crystalline Silicon Dioxide (SiO2) with Carbonate inclusions

Clear Quartz

Silicon Dioxide (SiO2)

Polished/tumbled brown stone, likely jasper or chert

Microcrystalline quartz (SiO₂), possibly iron-rich jasper or chert

Weathered fine-grained stone, likely sandstone or quartzite

Quartz-rich sandstone (possibly weakly metamorphosed quartzite); predominantly SiO₂

Fine-grained brown sand or weathered soil

Unconsolidated siliciclastic sediment, likely quartz-rich sand (SiO₂) mixed with iron-oxide-coated grains

Fluorite

Calcium Fluoride (CaF2)

Clear Quartz

Silicon Dioxide (SiO2)