Igneous And Metamorphic Derivative (Weathered)

Quartz / Quartz Cluster

Silicon Dioxide (SiO2)

Dark gray rounded river pebble

Likely basalt or fine-grained volcanic rock; exact identification requires testing

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Copper-Bearing Sulfide Ore (likely Chalcopyrite or Bornite)

Chalcopyrite (CuFeS2) or Bornite (Cu5FeS4) in host rock

Quartzite

Quartzite (SiO2)

Likely raw mica-bearing mineral fragment

Possibly biotite mica or a biotite-rich metamorphic fragment; identification is limited by the dark, blurred image

Greenschist

Greenschist facies rock

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Fe3O4)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Milky quartz with iron-oxide staining

Quartz (silicon dioxide, SiO₂)

Dark rounded pebble, likely basalt

Basalt (fine-grained mafic volcanic rock; commonly plagioclase, pyroxene, and olivine)

Tumbled quartz (likely rose or milky quartz)

Quartz, silicon dioxide (SiO₂)

Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered sandstone or iron-rich sedimentary fragment

Quartz-rich sandstone, possibly ferruginous sandstone (SiO₂-dominant)

Quartzite pebble

Crystalline silica (SiO2)

Banded Gneiss (with possible weathered sulfide or iron staining)

Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides

Quartz Pebble

Silicon Dioxide (SiO2)

White quartz pebble

Quartz (silicon dioxide, SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Magnetite Sand (Black Sand)

Magnetite (Fe3O4)

River Pebble (Quartz-rich)

Silicon Dioxide (SiO2) with impurities

Limonite-stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining

Quartz (Common or Milky)

Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3:Cr)

Diorite (Gneissic)

Diorite

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Quartz (Milky or Clear fragment)

Silicon Dioxide (SiO2)

Quartz (Milky/Crystalline fragment)

Silicon Dioxide (SiO2)

Fine-grained gray sandstone or quartz-rich sedimentary pebble

Likely quartz arenite or lithic sandstone; exact identification requires microscopy or testing

Soapstone (steatite), possibly talc-rich schist

Steatite; predominantly talc, Mg₃Si₄O₁₀(OH)₂, with possible chlorite, mica, and carbonates

Quartzite

Metamorphosed Quartz Sandstone

Rainbow Moonstone

White Labradorite (Plagioclase Feldspar), (Na,Ca)(Al,Si)4O8

Weathered gneiss

Foliated gneiss, chiefly quartz–feldspar–mica

Weathered schist

Mica schist, likely chlorite–biotite schist