Quartz Geode
Silicon Dioxide (SiO2) in a Geode body
sedimentary or igneous (host environment)
Category
Sedimentary Or Igneous (Host Environment)
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Quartz Geode
Silicon Dioxide (SiO2) within Sedimentary or Igneous host
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Small white mineral fragment
Indeterminate; possibly quartz, calcite, or feldspar
mineral
Likely quartz-bearing rock fragment
Quartz (SiO₂), possibly with iron-oxide staining or other mineral inclusions
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Morganite (Pink Beryl)
Beryllium aluminum silicate Be3Al2(SiO3)6
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary or igneous host
sedimentary
Pyritic Gneiss (with Garnet)
Gneiss containing Pyrite (FeS2) and Almandine Garnet (Fe3Al2(SiO4)3)
metamorphic
Unidentified small rock fragment
Likely quartz-rich material; exact identification is indeterminate from the image
mineral
Dark Agate / Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium impurities
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Wishing Stone (Quartz-veined Sedimentary Pebble)
Silicified sedimentary rock with quartz vein (SiO2)
sedimentary
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Milky Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Pyrite Geode (Sparkling Druzy)
Iron Sulfide (FeS2) in Sedimentary Nodule
mineral
Tiny amber-colored crystal fragment
Indeterminate; possibly quartz, feldspar, mica, or a sulfide mineral
mineral
Cloud Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Green-and-gold apatite-bearing rock, possibly epidote skarn
Apatite-group mineral, commonly fluorapatite (Ca₅(PO₄)₃F), with probable epidote and quartz; exact identification requires testing
mineral
Fossil gastropod in granite-like stone
Gastropoda indet.; enclosing rock likely polished granite or gneiss
fossil
Quartz pebble (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Sandstone with Quartz Vein
Arenite with Crystalline Silica (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Shale
Fissile mudrock (composed of clay-sized particles and detrital grains)
sedimentary
Mixed polished rock/mineral specimens
Indeterminate from image; likely quartz-bearing material with iron-oxide staining and possibly mica-rich schist
mineral
Granite / Pegmatite Pebble
Felsic intrusive igneous rock
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Limestone (Travertine/Tufa variant)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone with Brachiopod Mold Fossil
Sedimentary rock (Sandstone) with indeterminate Brachiopod mold
fossil
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Chalcedony on Ironstone
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3/FeOOH)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary