Mineral With Metamorphic Or Sedimentary Host

Quartz on Host Rock

Silicon Dioxide (SiO2)

Raw graphite-rich metamorphic rock (probable graphite schist)

Graphite schist; predominantly crystalline carbon (graphite, C) with mica and quartz

Milky Quartz in Gneiss

Quartzite / Foliated Gneiss containing SiO2

Corundum (Sapphire in Host Rock)

Corundum (Aluminum Oxide, Al2O3)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Quartz Vein in Host Rock

Silicon dioxide (SiO2) veining in silicate matrix

Quartz-veined Schist (or Metasandstone)

Metamorphic Rock with Quartz Veining (SiO2)

White quartz cluster

Quartz (silicon dioxide, SiO₂), likely a drusy or microcrystalline cluster

Wishing Stone (Basalt/Siltstone with Quartz/Calcite vein)

Carbonaceous Siltstone with Quartz (SiO2) or Calcite (CaCO3) vein

Gold in Quartz Matrix

Native Gold (Au) with Quartz (SiO2) and Slate/Shale

Quartz Druzy (on Matrix)

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock (Gneiss/Schist)

Silicon Dioxide (SiO2) within a metamorphic matrix

Milky quartz (rough fragment)

Quartz, silicon dioxide (SiO₂)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Quartz with Chlorite inclusions

Silicon Dioxide (SiO2) with Chlorite group minerals (hydrous magnesium iron alumino-silicate)

Red jasper pebble

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Quartz Pebble

Silicon Dioxide (SiO2)

Raw Agate (Chalcedony Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Greenstone

Greenschist (composed of chlorite, actinolite, and epidote)

Likely quartz-bearing rock or mineral fragment

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

Quartz with impurities or Host Rock

SiO2 (Silicon Dioxide) with mixed silicates

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Quartz Vein / Quartzite with Iron Oxide Staining

Silicon Dioxide (SiO2)

Quartz-rich breccia or silicified rock

Microcrystalline quartz (SiO₂) with iron-oxide staining and darker host-rock fragments

Likely garnet (rough crystal)

Garnet group, likely almandine (Fe₃Al₂(SiO₄)₃); identification from the image is uncertain

Greenstone / Greenschist

Greenschist (contains chlorite, epidote, actinolite)

Graphite-bearing metamorphic rock (probable graphite schist)

Graphite schist; predominantly quartz–mica–graphite, with possible feldspar and sulfide minerals

Weathered rock with a tan mineral vein or inclusion

Indeterminate from the photograph; possibly a quartz- or feldspar-rich vein in dark metamorphic host rock

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Rough Emerald in Matrix

Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium

Yellow Sapphire

Corundum (Al2O3) with iron impurities

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Pebble)

Silicon Dioxide (SiO2)

Quartz with inclusions

SiO2

Tumbled reddish-brown chalcedony, possibly carnelian

Chalcedony (microcrystalline quartz), SiO₂; red variety commonly called carnelian

Blue-dyed tumbled stone, likely howlite or magnesite

Likely dyed magnesite (MgCO₃) or howlite (Ca₂B₅SiO₉(OH)₅); identification is uncertain from the image

Unidentified yellow-orange mineral fragment

Possibly iron-stained quartz, calcite, or citrine; identification is uncertain from the image

Chrysotile Asbestos

Mg3Si2O5(OH)4

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Sandstone pebble

Sandstone (siliciclastic sedimentary rock)