Sedimentary Or Metamorphic

Clear Quartz

Silicon Dioxide (SiO2)

Jasper (Red Jasper)

Silicon Dioxide (SiO₂)

Quartz heart (likely milky/included quartz)

Quartz, silicon dioxide (SiO₂)

Quartz-rich rock, possibly milky quartz or quartzite fragment

Quartz (SiO₂), potentially quartzite if metamorphic

Goethite pseudomorph after Pyrite

Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)

Jasper (Green)

Silicon dioxide (SiO2)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Pyrite-bearing rock (likely pyrite-rich schist or massive pyrite)

Pyrite, FeS₂, possibly in a micaceous metamorphic matrix

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Amethyst and Hematite Bracelet

Amethyst (SiO2) and Hematite (Fe2O3)

Raw selenite (gypsum)

Gypsum, CaSO₄·2H₂O; translucent variety selenite

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Fossil shark tooth

Likely fossilized shark tooth, possibly *Carcharocles* or *Otodus* species

Unidentified Rock Fragment

Unknown

Tumbled orange chalcedony and a gray stone disk

Chalcedony (microcrystalline quartz, SiO₂); disk likely fine-grained sandstone or slate

Pyrite-bearing rock (iron pyrite)

Pyrite, FeS₂, likely disseminated or massive in a host rock

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pink-and-white banded quartzite or jasper

Quartzite, primarily microcrystalline SiO₂, possibly iron-stained quartz/chalcedony

Mixed pebble collection, including likely flint, quartzite, and fossil material

Varied silicate rocks; visible specimen may include chert (microcrystalline SiO₂), quartzite, and a possible fossil

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

SiO2 (Silicon Dioxide)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Yellow Jasper

Jasper (Silica-rich Microcrystalline Quartz, SiO2)

Pale green translucent mineral fragment, likely calcite

Calcite (CaCO₃), tentatively; possibly green fluorite or prehnite

Mixed collection of natural stones

Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks

Pyrite

Iron Sulfide (FeS2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Polished malachite

Malachite, Cu₂CO₃(OH)₂

Mixed rock and mineral specimen collection

Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks

Milky Quartz

Silicon Dioxide (SiO2)

Fossil shark tooth

Likely fossilized shark tooth, possibly Carcharhinus or Otodus species

Jasper

Jasper (Silicon Dioxide, SiO2)

Jasper (Red Jasper)

Silicon Dioxide (SiO2) with Hematite inclusions

Pearl

Pearl; primarily aragonite (CaCO₃) in nacre

Quartz

Silicon Dioxide (SiO2)

Likely quartz fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock

Red Jasper

SiO2 (Silicon Dioxide with Iron inclusions)

Desert rose

Gypsum (selenite) rosette, CaSO₄·2H₂O