Mineral With Metamorphic Or Sedimentary Host

Pyrite on Limestone

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

Quartz Pebble

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

Quartz (SiO2 - Silicon Dioxide)

Sugilite

KNa2(Fe,Mn,Al)2Li3Si12O30 (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)

Jasper with Quartz Vein

Microcrystalline quartz (SiO2) and chalcedony with a quartz vein

Chalcedony (Agate/Chert variety)

Silicon Dioxide (SiO2)

Orange chromium diopside (likely tumbled)

Diopside, CaMgSi₂O₆; orange color may reflect iron-rich composition or surface treatment/inclusion

Slickenside

Tectonic Fault Scarp Surface

Quartz-rich pegmatite, possibly with mica and feldspar

Granitic pegmatite; mainly quartz (SiO₂), feldspar, and biotite/muscovite mica

Druzy Quartz on Chert/Siltstone

Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix

Rough Emerald/Green Beryl

Beryl (Be3Al2(SiO3)6) with trace amounts of Chromium or Vanadium

Quartz-rich breccia or vein quartz with dark inclusions

Milky quartz (SiO₂), likely brecciated and cemented with iron oxides and dark mica/amphibole minerals

Likely weathered quartz-bearing rock (uncertain identification)

Possibly quartz-rich granite or granitic aplite; exact identification requires a clearer, larger image and tests

Quartz Vein in River Siltstone

Crystalline Quartz (SiO2) in Siliclastic Matrix

Green Tourmaline

Elbaite (Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH))

Blue Sapphire (Raw)

Corundum (Al2O3)

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Concrete

Anthropogenic Conglomerate

Serpentinite

Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)

Quartz Vein in Metamorphic Rock

Silicon Dioxide (SiO2) within Metasedimentary host

Quartz with Spessartine Garnet and Biotite

SiO2 (Quartz) with Mn3Al2(SiO4)3 (Spessartine)

Milky Quartz with Country Rock contact

Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock

Polished red banded stone, likely rhodonite

Rhodonite — manganese inosilicate, MnSiO₃; possibly rhodochrosite or dyed quartz

Milky quartz (rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Agate

Silicon Dioxide (Chalcedony), SiO2

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Geode with Iron Oxide

Silicon Dioxide (SiO2) with Hematite/Goethite coatings

Quartz Geode

Silicon Dioxide (SiO2)

Muscovite Mica (likely on Quartz/Feldspar)

Muscovite - KAl2(AlSi3O10)(OH)2

Beryl (Emerald variety in host rock)

Be3Al2(SiO3)6 (Silicate mineral)

Quartz Nodule / Agate Geode

Silicon Dioxide (SiO2)

Calcite in Matrix

Calcium Carbonate (CaCO3) on Sedimentary Host Rock

Common Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Serpentinite

Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, or Chrysotile)

Dragon Blood Jasper

Epidote and Pietersite-rich Quartz (SiO2 with inclusions)

Likely serpentine pebble

Serpentinite; predominantly serpentine-group minerals, Mg₃Si₂O₅(OH)₄

Raw purple fluorite crystal (tentative)

Fluorite, calcium fluoride (CaF₂)

Quartz-rich metallic sulfide ore (probable pyrite-bearing rock)

Pyrite, FeS₂, in a quartz-rich host; exact identification is uncertain from the image

Chalcedony with Druzy Quartz Geode

Silicon Dioxide (SiO2)

Banded Agate (Tumbled)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz Geode with Calcite

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)