Ferruginous Sandstone
Clastic Sedimentary Rock (Iron-rich)
sedimentary
Category
Sedimentary (Secondary Classification For A Weathered Mineral Specimen)
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Eclogite (retrograded)
Eclogite (Omphacite-Garnet rock)
metamorphic
Painted River Rock (likely Quartzite or Granite)
Quartzite or Granitic Gneiss (painted)
metamorphic
Pyrite on Quartz matrix
Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Granite River Cobble
Phaneritic Felsic Igneous Rock
igneous
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary
Azurite and Malachite on Matrix
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Vesicular Basalt (Scoria)
Basalt (Extrusive Igneous Rock)
igneous
Gabbro (likely with Pyrite/Sulfide mineralization)
Mafic Intrusive Igneous Rock
igneous
Silver (Jewelry Specimen)
Native Silver (Ag)
Mineral (Native Element)
Chert (specifically Flint or Nodular Chert)
Silicon dioxide (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Granite Pebble
Granite (Felsic Plutonic Rock)
igneous
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Dyed Agate Slice
Chalcedony (Silicon Dioxide, SiO2) with artificial pigment
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (Tafoni Weathered)
Arenite (part of the Sandstone family)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Fossil Rugose Coral (Horn Coral)
Order Rugosa (likely Grewingkia or Heliophyllum species); Calcium Carbonate (CaCO3)
sedimentary
Blue Dyed Agate
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Crystalline fragment)
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
igneous
Limonite (Iron Ore)
Limonite (unstructured hydrated iron(III) oxide-hydroxides, often FeO(OH)·nH2O)
mineral
Malachite
Malachite (Cu2(CO3)(OH)2 - a copper carbonate hydroxide mineral)
Mineral
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe2O3 enriched)
sedimentary
Agate
Cryptocrystalline Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt Pebble
Basalt (Mafic Igneous Rock)
igneous
Khondalite
Garnet-Sillimanite-Graphite Gneiss
metamorphic
Red Sandstone Pebble
Arenite (primarily Quartz SiO2 with Hematite Fe2O3 staining)
sedimentary
Porphyritic Basalt (with Weathered Jointing)
Porphyritic Basalt
igneous
Gold
Native Gold (Au)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Brown Quartz (Jasper or Chert)
Silicon Dioxide (SiO2)
sedimentary
Amygdaloidal Basalt with Quartz
Basalt (SiO2 inclusion)
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral