Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Ruby (Corundum)

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Quartz Geode

Silicon Dioxide (SiO2)

Basalt (River-worn Pebble)

Aphanitic Mafic Igneous Rock

Quartzite (or Ferruginous Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartzite

Quartzite (SiO2)

Granite River Pebble

Phaneritic Granite (primarily Quartz, Feldspar, and Mica)

Quartzite (Quartz-rich Cobble)

Quartzite (SiO2)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Pyritic Quartzite

Metequartzite with FeS2 (Pyrite) inclusions

Shattuckite (Blue Quartz/Jasper Matrix)

Shattuckite (Copper Silicate Hydroxide - Cu5(SiO3)4(OH)2)

Cone-in-cone structure (Limestone)

Cone-in-cone structure (Secondary Sedimentary Structure)

Sandstone (with potential trace fossils)

Clastic sedimentary rock (primarily SiO2)

Sandstone (with Lichen)

Arenite (composed primarily of SiO2)

Quartz (Citrine or Iron-Stained variety)

Silicon Dioxide (SiO2)

Limonite Geode / Ironstone Concretion with Quartz

Limonite with Quartz (FeO(OH)·nH2O + SiO2)

Yellow Agate

Agate (Varietal form of Chalcedony/Quartz, SiO2)

Garnet

Almandine (Fe3Al2(SiO4)3)

Quartzite (River Pebble)

Meta-quartzite (composed primarily of SiO2)

Basalt with Quartz/Feldspar Inclusions

Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining

Native Copper

Native Copper (Cu)

Amygdaloidal Basalt with Quartz/Zeolite Infill

Amygdaloidal Basalt (extrusive volcanic rock with SiO2 or CaAl2Si3O10·3H2O infill)

Bauxite

Bauxite (mixture of hydrous aluminum oxides: Al(OH)3 & AlO(OH))

Red Carnelian

Carnelian (Silicon Dioxide - SiO2)

Basalt Pebble

Basalt

Basalt Pebble

Extrusive Mafic Volcanic Rock

Orange Calcite

Calcium Carbonate (CaCO3)

Geode (Chert or Quartz Nodule)

Silicon Dioxide (SiO2)

Fossilized Sea Urchin (Echinoid)

Echinoidea (Class); commonly Clypeasteroida for sand dollar types

Hematite (Iron Ore)

Hematite (alpha-Fe2O3)

Granite

Granite (Phaneritic Acidic Igneous Rock)

Vesicular Basalt with Epidote

Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Limonite with Goethite

Iron Hydroxide Mixture (FeO(OH)·nH2O)

Gossan (with Limonite and Hematite)

Gossanous iron-oxide rock (Fe2O3 · nH2O)

Granite Cobble

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Milky Quartz with Epidote or Chlorite inclusions

Silicon Dioxide (SiO2) with inclusions of Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Amygdaloidal Basalt with Secondary Minerals

Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)

Basalt (Weathered/River worn)

Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)

Dyed Blue Agate

Cryptocrystalline Quartz (SiO2)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Granite Pebble (Salt and Pepper Granite)

Felsic Intrusive Igneous Rock (Granite)

Granite Cobble

Felsic Intrusive Igneous Rock

Yellow Jasper

Silicon dioxide (SiO2)