Fancy Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Category
Mineral (Biogenic)
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Ocean Jasper (Orbicular Jasper)
Silica (SiO2) with varied mineral inclusions
mineralogical specimen
Picture Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Sandstone (likely Siltstone variety)
Arenite / Siltstone (primary mineral SiO2)
sedimentary
Chert (Serpentinized)
Silicon Dioxide (SiO2) with mineral staining
sedimentary
Schist
Mica Schist
metamorphic
Auriferous Quartz (Gold-bearing Quartz)
Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides
mineral
Blue Quartzite (Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
metamorphic
Strawberry Quartz
Quartz (SiO2) with inclusions of Goethite or Hematite
Mineral
Silver (Native Element)
Ag (Argentum)
mineral
Bauxite
Alumina ore (Mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Amygdaloidal Basalt with Epidote
Vesicular Basalt with secondary Epidote/Quartz mineral infill
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Limonite
Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)
Mineral
Azurite-Malachite (often a mixed specimen)
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2(CO3)(OH)2. The specimen appears to be a natural mixture or intergrowth of these two minerals.
Mineral
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Sandstone (Calcareous or Ferruginous)
Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Magnetite (in matrix)
Magnetite (Fe3O4)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphism)
metamorphic
Brecciated Chert
Sedimentary Chert (SiO2) with Calc-Silicate mineralization
sedimentary
Jasper (var. Ocean or Polychrome Jasper)
Silicon Dioxide (SiO2) with iron and mineral inclusions
sedimentary
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Gneiss (Pebble)
Gneiss
metamorphic
Granite
Granite (Felsic intrusive igneous rock)
igneous
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Granite
Granite (Phaneritic Igneous Rock)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Vesicular Basalt with Amygdaloidal Infill
Basalt (Mafic Extrusive Igneous Rock)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8), and Mica)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite
Phaneritic Igneous Rock (Granite)
igneous
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Bumblebee Jasper
Fibrous Calcite with Arsenic and Sulfur inclusions
mineral
Yellow Quartz (Citrine or Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone (with garnet granules)
Clastic sedimentary rock (primarily SiO2 with Fe3Al2(SiO4)3 inclusions)
sedimentary
Porphyritic Basalt
Basalt (with plagioclase or k-feldspar phenocrysts)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral