Mineral With Metamorphic Or Sedimentary Host

Quartz with Schist Inclusion

Crystalline Silicon Dioxide (SiO2) with Muscovite/Biotite Schist

Epidote and Quartz in Basalt

Epidote [Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)] in Metabasalt

Shale

Argillite / Shale

Yellow chalcedony (likely honey agate/jasper)

Microcrystalline quartz, SiO₂; may contain iron-oxide inclusions

Quartz-rich geode or vuggy quartz rock

Quartz (SiO₂), likely with minor iron oxides and possibly calcite or feldspar

Vein-bearing metamorphic rock, likely gneiss or schist

Banded silicate rock; likely quartz–feldspar–mica gneiss with a quartz vein

Likely garnet (rough crystal)

Garnet group; possibly almandine, (Fe₃Al₂(SiO₄)₃)

Purple Chalcedony

Silicon Dioxide (SiO2)

Pyrite-bearing rock (likely pyrite-rich shale or matrix specimen)

Pyrite (FeS₂) in a fine-grained host rock; host is uncertain from the image

Pyrite (on host rock)

Iron Sulfide (FeS2)

Quartz Vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Igneous/Metamorphic Matrix

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Milky Quartz with Schist Matrix

Silicon Dioxide (SiO2) with Mica Schist Matrix

Milky Quartz with Hematite/Limonite staining

Silicon Dioxide (SiO2)

Quartz-rich geode or mineralized cavity in host rock

Likely a quartz-bearing geode; the pale crystals may be quartz (SiO₂), but the photo is not detailed enough for a firm identification.

Emerald in Matrix

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Quartz (Chalcedony/Agate nodule)

Silicon dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix

Iron-oxide-stained rock with a pale mineral vein

Likely limonite/goethite-stained quartz-bearing rock; exact identification is uncertain from the image

Dendritic Agate

Chalcedony (Silicon Dioxide) with Manganese or Iron Oxide inclusions

Agate (Plume/Moss variety)

Cryptocrystalline Quartz (SiO2) with iron/manganese inclusions

Turquoise

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

Copper-bearing Quartz Vein in Host Rock

Quartz with Malachite/Chrysocolla staining

Quartz Crystal Matrix

Silicon Dioxide (SiO2)

Milky Quartz Pebble with Matrix

Quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Clear quartz crystal fragment

Quartz, silicon dioxide (SiO₂)

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial purple dye

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly iron-stained or included in a mixed rock; exact identification is uncertain from the image

Tumbled or naturally etched mica-rich mineral specimen, likely muscovite

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly phlogopite mica

Likely polished bronzite or serpentine-rich rock

Probable bronzite, an iron-bearing orthopyroxene (Mg,Fe)SiO₃; exact identification requires testing

Garnet

Almandine (Fe3Al2(SiO4)3)

Serpentinite

Serpentine group minerals ((Mg, Fe)3Si2O5(OH)4)

Tumbled quartz-rich pebble, likely quartzite or chert

Quartz (SiO₂), possibly quartzite; exact identification is uncertain from the image

Turquoise

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

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within a metamorphic matrix

Milky Quartz on Matrix

Quartz (Silicon Dioxide, SiO2)

Quartz-rich pegmatite (likely feldspar–quartz rock)

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

Quartz-Veined Sandstone

Quartz-veined Arenite

Barite Rose on Marcasite

Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)