Mineral And Metamorphic Rock

Dark gray crystalline rock, possibly basalt

Basalt (tentative; plagioclase–pyroxene–iron oxide assemblage)

Unidentified gray mineral/rock fragment

Indeterminate from image; possibly quartz-rich material or mica-bearing schist

Amethyst and Ruby in Zoisite

Silicon Dioxide (SiO2) and Anyolite (Zoisite-Hornblende-Ruby mix)

Raw Emerald in Schist Matrix

Beryl (Be3Al2Si6O18) in Mica Schist

Serpentinite (likely serpentinized ultramafic rock)

Serpentine-group minerals, chiefly antigorite/lizardite; commonly derived from peridotite

Quartz-rich pebble, possibly milky quartz with dark inclusions

Quartz (silicon dioxide, SiO₂), likely with iron-oxide or mica inclusions

Small quartz-rich pebble, possibly milky quartz

Quartz (silicon dioxide, SiO₂)

Biotite Mica Schist

Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2

Banded Gneiss Pebble

Gneiss (Metamorphic Rock)

Banded gneiss (probable)

Gneiss, commonly quartz–feldspar–mica bearing

Likely quartz-rich stone, possibly milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz-rich rock, possibly milky quartz

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

Nephrite Jade

Nephrite

Quartz-rich metamorphic rock, likely milky quartz or quartzite

Quartz (SiO₂); possibly quartzite composed predominantly of recrystallized quartz

Weathered quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂), likely with iron-oxide staining and minor feldspar or carbonate impurities

Gneiss

Gneiss (foliated metamorphic rock)

Small red-brown mineral or rock fragment

Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide

Tumbled quartz-rich stone, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite (metamorphic rock)

Schist

Crystalline Metamorphic Rock (Schistose)

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly milky quartz or chalcedony

Milky quartz with iron-oxide staining

Quartz (SiO₂), likely with goethite/limonite coatings

Schist

Schist (metamorphic rock)

Greenstone (likely serpentinite or chlorite-rich metamorphic rock)

Probable serpentinite/chlorite schist; commonly dominated by serpentine-group minerals, chlorite, talc, and magnetite

Milky quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Weathered greenish metamorphic rock, likely serpentinite

Serpentinite, dominated by serpentine-group minerals (commonly antigorite, lizardite, or chrysotile)

Biotite-bearing gneiss or schist

Quartz–feldspar–biotite metamorphic rock

Quartz–feldspar mica-bearing metamorphic rock, likely gneiss or schist

Micaceous quartzofeldspathic gneiss/schist; chiefly quartz (SiO₂), feldspar, and biotite/muscovite mica

Tumbled quartz-rich pebble, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if metamorphically recrystallized

Quartz-veined Metamorphic Rock

Quartz Vein in Phyllite or Schist (SiO2 in Silicate Matrix)

Quartz Vein in Pelite (Metamorphic Rock)

Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Gneiss

Gneiss (Foliated Metamorphic Rock)

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

River Pebble (Gneiss or Quartzite mixture)

Metamorphic rock (Commonly Gneissic)

Mica Schist

Foliated Metamorphic Rock (Schist)

Schist

Mica Schist (Metamorphic rock)

Rhodonite-bearing metamorphic rock

Manganese-rich metamorphic rock, chiefly rhodonite (MnSiO₃), with quartz and manganese oxides

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Small rough mineral/rock fragment

Indeterminate; possibly quartz-bearing rock or weathered feldspar

Banded Agate

Silicon Dioxide (SiO2)

Quartz-Mica Schist (with Muscovite)

Metamorphic Rock (Quartz, Muscovite, Feldspar)