Metamorphic, Likely Sedimentary With Quartz Veins

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered foliated metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica metamorphic rock; exact identification requires a fresh surface and mineral tests

Quartz-bearing metamorphic rock, possibly epidote/quartzite

Quartz-rich rock with possible epidote and feldspar; exact identification requires testing

Quartz-bearing iron-rich rock, possibly quartzite or hydrothermal breccia

Quartz (SiO₂) with iron oxides/hydroxides, likely limonite/goethite; exact host rock is uncertain from the photograph

Crushed Limestone and Calcite

Calcium Carbonate (CaCO3)

Quartz / Limestone Gravel

SiO2 (Silicon Dioxide) and CaCO3 (Calcium Carbonate)

Milky quartz (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

White Quartz Beads

Silicon Dioxide (SiO2)

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂); possibly quartzite, a recrystallized quartz sandstone

Emerald with Matrix (Emerald in Mica Schist)

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Quartz Pebble (with probable iron staining)

Silicon dioxide (SiO2)

Quartz on Limestone

Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)

Milky quartz

Quartz (SiO₂), likely massive milky quartz

Quartz (specifically Milky Quartz/Quartzite)

Silicon Dioxide (SiO2)

Quartz (likely Rose Quartz or Milky Quartz based on color)

Quartz (SiO2 - Silicon Dioxide)

Small white mineral fragment

Indeterminate; possibly quartz, calcite, or feldspar

Quartz (likely a clear or rock crystal variety)

Quartz (SiO2 - Silicon Dioxide)

Milky Quartz with Chlorite/Moss Infusions

Silicon Dioxide (SiO2)

Quartz with Mica (Schist/Pegmatite fragment)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Weathered brown rock, likely sandstone or iron-rich quartzite

Indeterminate; probable quartz-rich sandstone (quartz, feldspar, iron oxides)

White Quartz

Quartz (SiO2)

Unidentified gray rock/mineral specimen

Indeterminate; possibly quartz-rich rock or a metallic sulfide-bearing specimen

Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)

Quartz (SiO₂ - Silicon Dioxide)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline to granular SiO₂, possibly with mica and feldspar

Clear Quartz (Rock Crystal Fragments)

Silicon Dioxide (SiO2)

Quartz with Host Rock

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Feldspar (specifically Orthoclase or Plagioclase)

Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate

Quartz (River Cobble)

Silicon Dioxide (SiO2)

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

River Pebble (Gneiss or Quartzite variant)

Course-grained Metamorphic Rock (likely SiO2 dominant)

Milky quartz-rich rock

Quartz (silicon dioxide, SiO₂), likely with mica or feldspar inclusions

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartzite with Iron Inclusions

Quartzite (SiO2)

Tumbled brown quartzite or jasper

Quartzite (mostly SiO₂), possibly iron-rich jasper (microcrystalline quartz)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Iron-stained quartz-rich rock, possibly gold-bearing quartz

Quartz (SiO₂) with iron-oxide staining; possible limonite/goethite matrix

Milky Quartz Pebble with Iron staining

Silicon Dioxide (SiO2)