Sedimentary Or Metamorphic

Tumbled chalcedony (likely milky quartz)

Microcrystalline quartz, SiO₂; possibly pale agate or quartzite

Limonite after Pyrite (Prophecy Stone or Ironstone Concretion)

Goethite/Limonite pseudomorph after Pyrite/Marcasite (FeO(OH)·nH2O)

Mixed mineral and rock collection, including likely amethyst and assorted tumbled stones

Unidentified mixed specimens; visible purple quartz is likely amethyst (SiO₂)

Jasper (Green)

Silicon dioxide (SiO2)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)

Calcite

Jasper (Red Jasper)

Silicon Dioxide (SiO₂)

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

Pyrite, FeS₂, possibly in a micaceous metamorphic matrix

Quartz heart (likely milky/included quartz)

Quartz, silicon dioxide (SiO₂)

Goethite pseudomorph after Pyrite

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

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

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

Small metallic-gold mineral fragment, possibly pyrite

Pyrite (FeS₂), if confirmed

Carved red coral bead (likely coral or coral-colored resin)

Corallium spp. (precious coral; calcium carbonate, CaCO₃)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Fossil shark tooth

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

Unidentified Rock Fragment

Unknown

Pink-and-white banded quartzite or jasper

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

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

Mixed rock and mineral specimen collection

Varied silicate, carbonate, and oxide minerals; individual identification is not possible from this group photograph

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

SiO2 (Silicon Dioxide)

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

Yellow Jasper

Jasper (Silica-rich Microcrystalline Quartz, SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Pale green translucent mineral fragment, likely calcite

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Mixed collection of natural stones

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

Pyrite

Iron Sulfide (FeS2)

Clear calcite cleavage fragment

Calcite (calcium carbonate, CaCO₃)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Green calcite (probable)

Calcite, calcium carbonate (CaCO₃)

Calcite

Calcite (CaCO₃, Calcium Carbonate)

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)