Mineral, Possibly Rock Fragment Containing A Mineral

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

Sunstone

Oligoclase or Andesine (Labradorite) Feldspar (Na,Ca)(Si,Al)4O8

Fluorite in Matrix

Fluorite (CaF2) within a host rock matrix

Ferruginous Quartz (Carnelian-tinted Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Emerald in Host Rock

Beryl (Be3Al2Si6O18) containing Chromium and/or Vanadium

Basalt

Basalt

Basalt with Granite Inclusions (Xenoliths)

Mafic igneous rock (Basalt) with Sialic minerals

Mica Schist

Crystalline Schist (often containing Muscovite, Biotite, and Quartz)

Schist

Mica Schist

Snowflake Obsidian

Volcanic glass containing Spherulitic Cristobalite (SiO2)

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Basalt

Mafic Extrusive Igneous Rock

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Sandstone

Arenite

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone

Arenite (primarily SiO2)

Mica Schist

Mica Schist (Composition typically contains Muscovite: KAl2(AlSi3O10)(OH)2 or Biotite: K(Mg,Fe)3AlSi3O10(OH)2 along with Quartz and Feldspar)

Conglomerate

Conglomerate (clastic sedimentary rock)

Purple Dyed Agate Geode (Banded Chalcedony)

Silicon Dioxide (SiO2) - variety: Agate

Geode (unopened)

Chert / Chalcedony Geode (SiO2)

Basalt with Quartz Veining

Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)

Sandstone

Arenite

Granitic Pegmatite

Granite Pegmatite (principally KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)

Blue Dyed Agate Geode

Chalcedony (cryptocrystalline Quartz), SiO2

Breciated Limestone with Calcite Veins

Sedimentary Breccia (CaCO3)

Sandstone

Arenite (primarily SiO2)

Schist/Phyllite

Metamorphic Schist (Chlorite Schist variety)

Sandstone (Tumbled/River Pebble)

Arenite (composed primarily of SiO2)

Rhyolitic Tuff

Rhyolitic Tuff / Pyroclastic rock

Basalt

Mafic volcanic rock (various silicate minerals including Pyroxene and Plagioclase)

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Fluorite with Rhodochrosite

Fluorite (CaF2) and Rhodochrosite (MnCO3)

Basalt with Amygdaloidal Inclusions

Aphanitic Mafic Volcanic Rock (Basalt)

Sandstone with Quarzite clasts

Arenite (SiO2 based)

Sandstone (Pebble)

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 principal)

Sandstone

Arenite (primarily SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)