Mineral On Sedimentary Rock

Chert (Iron-Stained)

Microcrystalline Silica (SiO2)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)

Greywacke (River Slikenside)

Greywacke (Lithic Sandstone)

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Chert (Chert Nodule with Chalky Cortex)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Gneiss

Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)

Rock Salt (Halite)

Halite (Sodium Chloride, NaCl)

Mica Schist with Iron Staining

Mica Schist

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)

Chert / Flint

Chert (Cryptocrystalline Silica, SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2) with iron oxide impurities

Chert (Field Stone/Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Brachiopod Fossil in Shale

Phylum Brachiopoda (often species of Order Spiriferida or Rhynchonellida)

Crinoid Fossil in Limestone

Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)

Druzy Quartz Geode (likely Smokey Quartz variety)

Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Laterite (iron-rich nodule, possibly Bauxite as a subtype)

Laterite (composed of various minerals including goethite, hematite, gibbsite, etc.)

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Druze (on Matrix)

Silicon Dioxide (SiO2)

Shungite

Non-crystalline carbon (allotrope of carbon)

Conglomerate

Conglomerate (Sedimentary Clastic Rock)

Petrified Wood

Silicified Wood (SiO2)

Conglomerate with Quartz Inclusions

Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Limestone (specifically Iron-stained or Argillaceous Limestone)

Calcium Carbonate (CaCO3) with Iron Oxide (Fe2O3) impurities

Limestone

Calcium Carbonate (CaCO3)

Conglomerate

Clastic sedimentary rock (Polymictic Conglomerate)

Conglomerate

Conglomerate (clastic sedimentary rock type)

Coquina / Fossiliferous Limestone

Calcareous bioclastic sedimentary rock (CaCO3)

Carnelian Agate

Silicon Dioxide (SiO2) with Iron Oxide impurities

Desert Rose

Gypsum (CaSO4·2H2O) or Baryte (BaSO4) with trapped sand grains

Basalt River Stone

Basalt

Jasper and Quartzite Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Note: No specimen visible

Milky Quartz

Silicon Dioxide (SiO2)

Fossilized Bone Fragment

Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)

Schist

Mica Schist

Chalcedony

Silicon dioxide (SiO2) - Cryptocrystalline Quartz

Conglomerate

Conglomeratic Sandstone