Sedimentary Or Metamorphic (Base Substrate)

Red Jasper (Opaque Chalcedony)

Silicon Dioxide (SiO2) with Hematite inclusions

Epidote

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Biotite-rich schist (mica schist)

Mica schist, chiefly biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH,F)₂), with possible quartz and feldspar

Gneiss

Gneiss

Mica-rich schist, likely lepidolite or muscovite schist

Mica schist; predominantly muscovite KAl₂(AlSi₃O₁₀)(OH)₂, possibly lithium-rich lepidolite

Gneiss (specifically a Banded Gneiss pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Polished mica-rich metamorphic sphere

Likely mica schist or garnet-mica schist; exact identification is uncertain from the photograph

Mixed river gravel (alluvial conglomeratic sediment)

Polymictic alluvium; composition includes quartz, feldspar, chert, granite, basalt, and metamorphic rock fragments

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Schist with Quartz Vein

Mica Schist with Crystalline Quartz (SiO2)

Quartz Pebble with Host Rock / Schist Matrix

Silicon Dioxide (SiO2) with Metamorphic Host Rock

Sandstone

Arenite (SiO2 based)

Mica Schist with Biotite or Muscovite

Metamorphic rock rich in sheet silicates

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Chert Arrowhead

Cryptocrystalline Quartz (SiO2)

Mica Schist

Schist (muscovite/biotite rich regional metamorphic rock)

Graphite-rich schist (likely graphite ore)

Graphite-bearing schist; predominantly graphitic carbon (C) with mica, quartz, and possible feldspar

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

Basalt (Weathered River Pebble)

Extrusive Igneous Rock

Greenschist (or Serpentinite) with Quartz-Feldspar Vein

Metabasalt / Greenschist Facies Rock

Muscovite

Muscovite, KAl2(AlSi3O10)(OH)2

Epidote

Calcium aluminum iron silicate (Ca2(Al, Fe)3(SiO4)3(OH))

Granitoid (Granite/Gneiss mix)

Granite or Granitic Gneiss (Silicon dioxide SiO2 with Al, K, Na silicates)

Garnet Schist

Almandine-Garnet Mica Schist

Fuchsite Schist with Quartz

Chromian Muscovite [K(Al,Cr)2(AlSi3O10)(OH)2] Schist

Biotite mica schist (probable)

Mica schist, dominated by biotite; approximate mica formula K(Mg,Fe)₃AlSi₃O₁₀(OH)₂

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or iron-oxide impurities

Fossilized Shark Tooth

Eocene Lamniformes (Mackerel Shark clade)

Sandstone / Chert Gravel

SiO2 (Silicon Dioxide based clastic sedimentary rock)

Common Gravel / Pebble

Lithified rock fragment / Detrital sediment

Banded calcite (likely cave deposit or vein fragment)

Calcite, CaCO₃

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly milky quartz or chalcedony

Quartzite

Metamorphic Quartzite (SiO2)

Basalt Pebble

Extrusive Igneous Rock

Magnesite or Howlite (dyed or naturally patterned)

Magnesium carbonate (MgCO3) or Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Venetian Gold Granite

Phaneritic Felsic Igneous Rock (Granite)

Quartzite Cobble

Quartzite (SiO2 based)

Sandstone (Ferruginous)

Arenite with Iron oxide staining (SiO2 with Fe2O3)

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite Cobble

Quartzite (SiO2 based metamorphic rock)