Sedimentary Rock (Possibly Composed Of Various Minerals)

Gneiss

Gneiss

Tumbled dark igneous rock, likely basalt

Basalt; commonly composed of plagioclase feldspar, pyroxene, and olivine

Red Jasper

Silicon Dioxide (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Unakite

Altered Granite (Granitic Metamorphic Rock)

Granite

Phaneritic Intrusive Igneous Rock (composed of Quartz, Feldspar, and Mica)

Granite

Intrusive Igneous Rock

Brecciated jasper, possibly rainforest jasper

Jasper: microcrystalline to cryptocrystalline quartz, SiO₂, commonly containing hematite, goethite, chlorite, epidote, and other iron- and manganese-bearing minerals

Chalcedony

Chalcedony (SiO2)

Seashell Fossil

Gastropoda fossil

Marble

Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)

Gneiss

Gneiss (foliated metamorphic rock)

Jasper (Green Jasper/Chert)

Silicon Dioxide (SiO2)

Slate

Foliated low-grade metamorphic rock

Dark gray volcanic rock, probably andesite or basalt

Fine-grained mafic–intermediate volcanic rock; likely basalt (plagioclase ± pyroxene), possibly andesite

Granite

Intrusive Igneous Rock

Snowflake Obsidian

Volcanic glass containing Spherulitic inclusions (SiO2 + impurities)

Tumbled Stones (various)

Mixed Silica-based Minerals (primarily Quartz and Chalcedony)

Gneiss

Gneiss

Pebble

Lithic fragment / Water-worn rock

Quartz (Druzy)

Silicon Dioxide (SiO2)

Small dark mineral/rock fragment

Indeterminate; possibly magnetite-bearing basalt or iron-rich slag

Chert

Silicon dioxide (SiO2)

River Pebble (Gravel)

Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)

Red jasper (iron-rich chalcedony), possibly brecciated

Jasper: microcrystalline quartz, SiO₂, colored mainly by iron oxides/hydroxides

Psilomelane (Black Hematite/Manganese Ore)

Barium Manganese Oxide (Formula: BaMn9O18(OH)4)

Weathered iron-rich sandstone or conglomeratic sedimentary cobble

Ferruginous sandstone, possibly polymictic conglomerate

Limonite (Ironstone)

Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)

Fluorite, Turquoise, and Calcite set

Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals such as Antigorite, Lizardite, and Chrysotile)

Fossil Shell

Phylum Mollusca (Bivalvia or Brachiopoda)

Shale

Clastic sedimentary rock (primarily clay and silt minerals)

Limestone

Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)

Tumbled Mineral Collection (Amethyst, Celestite, K2 Jasper, Rose Quartz, Ruby in Zoisite, Que Sera Stone)

Mixed Mineral Specimens (Quartz SiO2, Celestite SrSO4, Corundum Al2O3 with Zoisite, etc.)

Fossilized Bone Fragment

Vertebrate Fossil

Serpentinite (Serpentine Rock)

Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Gemstones (Emerald and Yellow Topaz or Citrine)

Beryl (Be3Al2Si6O18) and Quartz (SiO2) or Topaz (Al2SiO4(F,OH)2)

Mixed Quartz Bracelet (Rose Quartz and Larimar-colored beads)

Silicon Dioxide (SiO2) with various inclusions

Quartz (Crystal/Druzy Quartz)

Quartz (SiO₂)