Antropogenic (Man Made)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (often called Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Chert / Flint

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic Igneous Rock (Quartz-Feldspar-Mica)

Serpentinite

Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)

Goldstone

Not a natural mineral or rock. It is an ornamental glass.

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Quartzite or Quartz Vein Material

SiO2

Granite fragment

Granite

Granite

Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)

Seraphinite

Clinochlore (Mg,Fe)5Al(AlSi3O10)(OH)8 - specific variety for Seraphinite due to its fibrous inclusions and chatoyancy.

Pumice

Vesicular volcanic rock, primarily silica-rich volcanic glass (commonly rhyolitic or dacitic)

Chert Pebble

Microcrystalline Quartz (SiO2)

Granite

Granite (composed primarily of silica-rich minerals like quartz and feldspar)

Limestone

Calcium Carbonate (CaCO3)

Granite

Plutonic felsic igneous rock

Quartz

Quartz (SiO₂)

Porphyritic Basalt or Diabase with Plagioclase Phenocrysts

Porphyritic Basalt or Diabase; Mineral: Plagioclase Feldspar

Granite

Felsic intrusive igneous rock

Granite

Felsic Plutonic Rock

Granite

Felsic Intrusive Igneous Rock

Granite

Granite (Phaneritic Igneous Rock)

Granite Pebble

Igneous Intrusive Rock (Quartz-Feldspar-Mica Phenocrysts)

Olivine in Basalt matrix

Peridotite (Mg, Fe)2SiO4

Pink granite (likely weathered)

Granite; predominantly quartz, potassium feldspar, plagioclase, and mica

Brown Sandstone Pebble

Clastic Sandstone (SiO2 with iron oxides)

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Milky Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Granite

Felsic Plutonic Rock (Granite)

Chert (Quartz Variety)

Chert (Silicon Dioxide, SiO2)

Ferruginous Sandstone

Sandstone, Iron-rich

Chert (Flint)

Microcrystalline Silica (SiO2)

Coarse-grained mica-bearing metamorphic rock, likely schist

Mica schist, probably muscovite–biotite schist with quartz and feldspar

Weathered basalt or mafic volcanic rock

Basalt; primarily plagioclase feldspar, pyroxene, and possibly olivine

Vesicular volcanic rock, possibly weathered basalt or scoria

Basaltic scoria/vesicular basalt; predominantly plagioclase, pyroxene, and iron-titanium oxides

Rounded basalt pebble

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with minor olivine or magnetite

Granite

Plutonic felsic igneous rock

Granite

Phaneritic plutonic rock (SiO2-rich)

Granite

Plutonic felsic igneous rock

Granite

Granite (Felsic Plutonic Rock)

Granite

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Limestone with Fossil Inclusion

Sedimentary Calcium Carbonate (CaCO3)