Mineral With Metamorphic Or Sedimentary Host

Brown Agate

Silicon Dioxide (SiO2)

Chert Nodule or Concretion

Microcrystalline Quartz / Sedimentary Nodule

Dolomite or Limestone (Carbonate Rock)

CaMg(CO3)2 (Dolomite) or CaCO3 (Limestone / Calcite)

Pyrite on Limestone

Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix

Milky quartz (likely quartz-rich vein fragment)

Quartz, silicon dioxide (SiO₂)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Dragon Blood Jasper

Epidote and Pietersite-rich Quartz (SiO2 with inclusions)

Fuchsite on Quartz

Muscovite (KAl2(AlSi3O10)(OH)2) with Chromium impurities

Quartz-rich rock fragment, possibly milky quartz with iron staining

Quartz (SiO₂), potentially vein quartz or quartz-bearing pegmatite

Smoky Quartz (Herkimer-style)

Silicon Dioxide (SiO2)

Milky quartz-bearing rock, possibly quartzite

Quartz (SiO₂), likely in a quartzite or quartz-rich metamorphic matrix

Milky quartz (quartz-rich rock fragment)

Quartz, silicon dioxide (SiO₂)

Blue calcite geode

Calcite (CaCO₃), commonly a druse-lined geode

Druzy Quartz on Matrix

Silicon Dioxide (SiO2) on host rock

Quartz Geode

Silicon Dioxide (SiO2) in sedimentary host rock

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Pink calcite (likely manganocalcite)

Calcite, CaCO₃; pink color commonly caused by manganese impurities

Vuggy Quartz on Matrix

Silicon Dioxide (SiO2)

Carnelian

Carnelian (Chalcedony / SiO2)

Quartz with Iron Oxide Staining

SiO2

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Chert with Quartz Vein

Silicon dioxide (SiO2)

Tumbled jasper (likely brown jasper)

Microcrystalline quartz/chalcedony (SiO₂), colored mainly by iron oxides

Malachite in Host Rock

Malachite - Cu2CO3(OH)2

Quartz crystal cluster (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Milky quartz vein fragment

Quartz, silicon dioxide (SiO₂)

Clear quartz crystal

Quartz (SiO₂), likely a small hexagonal prismatic crystal

Wishing Rock (Quartz Vein in Host Rock)

Silicon dioxide (SiO2) vein in various host rocks

Quartz with Host Rock Matrix

Silicon Dioxide (SiO2)

Blue-andalusite (likely chiastolite-bearing metamorphic fragment)

Andalusite, Al₂SiO₅; possibly mixed with quartz/mica

Gold Ore

Native Gold (Au) in Matrix

Tumbled white quartz pebble

Quartz, silicon dioxide (SiO₂), likely milky quartz

Quartz Geode (Cracked Open Fragment)

Silicon Dioxide (SiO2)

Quartz on Matrix

Silicon Dioxide (SiO2)

Tumbled milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Weathered iron-rich rock, possibly hematite-bearing breccia

Hematite (Fe₂O₃)-rich lithic fragment; exact host rock is uncertain from the image

Quartz–feldspar pegmatite fragment

Granitic pegmatite; chiefly quartz (SiO₂) and feldspar, with possible mica/amphibole

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Milky quartz-rich rock

Quartz (SiO₂), likely massive milky quartz with minor iron-stained gangue

Druzy Chalcedony (Agate Geode)

Silica (SiO2) - Cryptocrystalline Quartz with druzy macrocrystalline quartz

White quartz crystal (likely milky quartz)

Quartz, silicon dioxide (SiO₂); possibly chalcedony if the interior is cryptocrystalline