Sedimentary And Metamorphic

Painted River Rock

Artificially Coated Sedimentary Rock

Sandstone with Liesegang Rings

Quartzose Sandstone with Iron Oxide Precipitation

Mixed collection of common river stones

Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material

Painted River Rock

Painted Quartzite or Smooth Siltstone

Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Mixed river stones and gravel

Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate

Likely quartz-rich metamorphic rock (quartzite or quartz-veined schist)

Quartzite/siliceous schist; chiefly quartz (SiO₂), with probable mica and iron-oxide staining

Quartz-rich river pebble, likely milky quartz

Milky quartz (SiO₂), possibly a quartzite or quartz-rich silicate pebble

Greenschist

Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)

Quartzite Chert Pebble

Sedimentary Chert / Metamorphic Quartzite (SiO2)

K2 Stone

Azurite in Granite

Weathered fine-grained stone, likely sandstone or quartzite

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

Rounded gray stone, likely slate or fine-grained sandstone

Probable slate (low-grade metamorphosed shale) or lithic sandstone; exact identification requires testing

Anthracite Coal

Anthracite (Carbon-rich Sedimentary-to-Metamorphic Rock)

Beach Pebble (Quartzite / Sandstone)

Quartz-rich sedimentary or metamorphic rock pebble

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Quartz-rich limestone or calcitic marble

Calcite (CaCO₃), possibly with quartz (SiO₂)

Anthracite Coal

Anthracite (Carbon-based sedimentary-derived metamorphic rock)

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Calcite

Calcite (CaCO3)

Tiger's Eye

Quartz pseudomorph after crocidolite (SiO2)

Oyster shell fragment

Ostreidae shell; primarily calcite (CaCO₃)

River Pebbles and Quartz

Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)

Orange Calcite (likely polished specimen)

Calcite

Jasper Conglomerate (Puddingstone)

Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)

Limonite pseudomorph after pyrite

Goethite / Limonite pseudomorph after Pyrite (Fe3+O(OH) replacing FeS2)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Polished Stone Pendant (Identity Unclear)

Unknown (Possibly Jasper/Agate/Quartz mixture)

Zoisite with Rubellite (Ruby in Zoisite)

Zoisite with inclusions of Hornblende (Anyolite)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Specular Hematite with Quartz and Limonite

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

White Buffalo Turquoise (or Howlite/Magnesite)

Calcite/Dolomite or Magnesite with Chert/Quartz inclusions

Zoisite with Ruby (Anyolite)

Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)

Gravel (Crushed Stone Aggregates)

Mixed Siliciclastic / Carbonate Aggregate

Mixed Tumbled Rocks and Minerals Collection

Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)

Quartz

Silicon Dioxide (SiO2)

Pyrite in Quartzite/Graphite Matrix

Iron Sulfide (FeS2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Agate

SiO2 (Chalcedony/Quartz)

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)

Calcite

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Pyrite (FeS2)