Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)
Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)
mineral
Category
Mineral (Synthetic)
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Amphibolite
Amphibolite
metamorphic
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Quartz Geode (Nodule)
Silicon Dioxide (SiO2)
sedimentary or igneous
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxides)
sedimentary
Red Sandstone
Arenite (composed primarily of Quartz and Iron Oxide)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminum - CuAl6(PO4)4(OH)8·4H2O
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Red Sandstone
Sandstone (principally Quartz with Iron Oxide coating)
sedimentary
Limonitic Sandstone (Stained Sandstone)
Clastic Sedimentary Rock with Iron Oxide (Limonite/Goethite) staining
sedimentary
Coprolite
Fossilized Feces
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Sandstone
Arenicola (comprising mostly Quartz, SiO2)
sedimentary
Red Sandstone (Hematitic)
Clastic sedimentary rock (SiO2 with Fe2O3 inclusions)
sedimentary
Sandstone (Ferruginous)
Arenite (with Goethite/Limonite cement)
sedimentary
Botryoidal Hematite (Iron Stone Conglomerate)
Hematite (Fe2O3) in sedimentary matrix
sedimentary
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
mineral
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Sandstone
Arenite
sedimentary
Quartz (Milky/Crystalline fragment)
Silicon Dioxide (SiO2)
mineral
Magnetite (Lodestone variety)
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Mixed Gemstone Collection
SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Basalt with Quartz Vein
Mafic volcanic rock with hydrothermal SiO2 filling
igneous
Dendritic Agate
Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)
Mineral
Quartz with inclusions (likely Chlorite or Hornblende) and country rock
SiO2 (Quartz) with associated ferromagnesian minerals
Mineral/Igneous/Metamorphic association
Granite
Granite
Igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Grey Quartz Variant)
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz / Quartzite Fragment
Silicon Dioxide (SiO2)
igneous, sedimentary, or metamorphic (mineral-based)
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Mahogany Obsidian
Volcanic glass containing Magnetite/Hematite
igneous
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartz (Common or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Iron-stained)
Silicon Dioxide (SiO2)
mineral