Man Made Composite (Lithified Equivalent Of Sedimentary)

Mixed Quartz and River Pebbles (Stone Collection)

Mixed assortment containing mainly Silicon Dioxide (SiO2)

Chrysoprase

Chrysoprase (a variety of Chalcedony, SiO₂)

Quartz (in a rock matrix)

Quartz (SiO2)

Quartz (likely a form of massive or vein quartz)

Quartz (SiO₂)

Hematite (beads)

Hematite (Fe₂O₃)

Green Aventurine and Clear Quartz

Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

River Pebbles (Sandstone and Quartzite)

SiO2 (Quartz) dominated clastic rocks

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Red Jasper or Chert

Jasper (SiO2, a variety of chalcedony with iron oxide impurities), Chert (SiO2)

Red Jasper (beads)

Silicon Dioxide (SiO2) with iron inclusions

Pyrite

Iron Pyrite (FeS₂)

Limonite (Iron Ore)

Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)

Dendritic Agate (or Dendritic Opal)

SiO2 (for Agate), SiO2·nH2O (for Opal)

Quartz (likely milky/gray variety)

Quartz (SiO₂)

Granite

Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)

Yellow Jade (often Serpentine or Dolomite)

Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.

Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)

Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)

Laterite

Laterite (no specific mineral formula as it's a rock type)

Jasper with Hematite (Red Jasper)

Silicon Dioxide with Iron Oxide (SiO2 and Fe2O3)

Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)

Quartz (SiO₂)

Banded Iron Formation (BIF)

Banded Iron Formation

Pebble

Clast (specifically a granule or small pebble)

Banded Iron Formation

Banded Iron Formation (BIF)

Fluorite

Fluorite (Calcium Fluoride - CaF2)

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Kyanite

Kyanite (Al2SiO5)

Orthoclase Feldspar (or K-Feldspar)

Orthoclase (KAlSi3O8)

African Turquoise

Teal Jasper (Macro-crystalline Quartz/Sio2 + Inclusions of Copper, Iron, and Manganese)

Quartz

Silicon dioxide (SiO2)

Quartz (likely a clear or rock crystal variety)

Quartz (SiO2 - Silicon Dioxide)

Quartz (pebble)

Quartz (SiO₂)

Quartz (possibly milky quartz or quartz with inclusions)

SiO2 (Silicon Dioxide)

Unidentified Rock Fragment

Unknown

Rock Crystal Quartz

Quartz (SiO₂)

Green Calcite

Calcite (CaCO3)

Banded Gneiss (River Cobble)

Gneiss (a high-grade metamorphic rock)

Quartz Geode (partially formed/chalcedony with iron staining)

Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)

Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.

Fossilized Wood (Petrified Wood)

Silicified Wood (primarily quartz/chalcedony replacing organic matter)