Metamorphic, Likely Sedimentary With Quartz Veins

Pyrite in Matrix (likely Quartz or Coal)

Iron Sulfide (FeS2)

Uncertain dark metamorphic rock, likely schist or slate

Foliated silicate rock; possibly chlorite–mica schist or slate

Graphite-bearing schist (probable)

Graphite schist; primarily quartz, mica, and graphite (carbon)

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-veined schist; predominantly SiO₂ (quartz) with possible feldspar, mica, and iron-oxide minerals

Jasper (Green Jasper/River Stone)

Silicon Dioxide (SiO2) with impurities

Slate

Slate; fine-grained metamorphosed shale, commonly quartz–muscovite/chlorite rich

Pink Quartz

Silicon Dioxide (Quartz), SiO2

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Quartz (likely a form of massive or vein quartz)

Quartz (SiO₂)

Milky quartz with iron-oxide staining

Quartz (SiO₂), massive variety; minor hematite/goethite staining

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Rounded gray stone, likely slate or fine-grained sandstone

Probable slate (low-grade metamorphosed shale) or lithic sandstone; exact identification requires testing

Tumbled quartz (likely milky or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Pyrite in Matrix (Quartz/Schist)

Iron Sulfide (FeS2)

Milky quartz-rich rock

Quartz, crystalline silica (SiO₂), likely massive milky quartz with minor feldspar or mica

Colorless quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Tumbled cream-colored stone, possibly calcite or quartz

Indeterminate from image; likely calcite (CaCO₃) or milky quartz (SiO₂)

Banded gneiss

Gneiss, likely quartz–feldspar–mica gneiss

Tumbled quartz pebble

Quartz, silicon dioxide (SiO₂)

Milky quartz / quartz vein fragment

Quartz, silicon dioxide (SiO₂)

Raw quartz-rich rock, likely milky quartz

Quartz (silicon dioxide, SiO₂), possibly quartzite or a quartz-bearing host rock

Tumbled milky quartz (probable)

Quartz, silicon dioxide (SiO₂)

Quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂); if quartzite, recrystallized quartz sandstone

Likely quartz-bearing rock or mineral fragment

Indeterminate; possibly quartz (SiO₂) with iron-oxide staining and darker matrix

White quartz pebble (probable)

Quartz, silicon dioxide (SiO₂)

Iron-stained quartz vein in a fine-grained host rock

Quartz (SiO₂) filling a fracture in an unidentified silicate rock; orange coloration likely from iron oxides/hydroxides

Quartzite or Chert Pebble

SiO2 (dominant)

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Quartz-rich rock, likely milky quartz or quartzite

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

Pale green calcite

Calcite (CaCO₃)

Quartz (specifically Milky/White Quartz)

Silicon Dioxide (SiO2)

Quartz (likely heat-treated or colored cord)

Silicon Dioxide (SiO2)

Likely quartz-rich mineral fragment

Quartz (SiO₂), possibly a small piece of milky quartz or calcite

Rhodonite-bearing gneiss

Manganese-rich biotite gneiss with rhodonite (MnSiO₃)

Quartz vein in foliated metamorphic rock

Milky quartz (SiO₂) in likely schist or gneiss

Pyrite

Iron Sulfide (FeS2)

Quartz (Milky or Smoky Quartz)

Silicon Dioxide (SiO2)

Quartz-rich hydrothermal vein rock, possibly quartzite

Mostly SiO₂ (quartz), with probable iron oxides and minor sulfides

Greenstone pebble

Likely chlorite- and/or actinolite-bearing metamorphic rock; exact composition cannot be determined from the image.

Quartz-bearing metamorphic rock, likely quartzite

Quartzite; predominantly quartz (SiO₂), with possible feldspar, mica, and iron-oxide staining

Weathered quartz-rich rock, likely quartzite

Quartzite (mostly SiO₂), possibly quartz-rich sandstone or milky quartz vein material

Quartz fragment

Quartz (silicon dioxide, SiO₂)