Geode (Quartz / Chalcedony Geode)
SiO2 (Silicon Dioxide)
sedimentary
Category
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Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Quartz River Pebble
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt
Vesicular Basalt
igneous
Sandstone Pebble with Mineral Encrustation
Quartz Sandstone with Calcite/Halite Crust
sedimentary
Granite Pebbles
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)
igneous
Quartz with Sericite and Cinnabar
Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)
mineral
Shale
Laminated Mudstone (Shale)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone with Iron Banding
Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)
sedimentary
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Desert Rose
Gypsum (CaSO4·2H2O) or Barite (BaSO4)
mineral
Weathered volcanic rock, likely andesite or basaltic-andesite
Fine-grained plagioclase–pyroxene volcanic rock; possible altered andesite (exact identification requires testing)
igneous
Basalt with Quartz Vein
Extrusive Igneous Rock / Volcanic Rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)
igneous
Unidentified dark mineral/rock fragment
Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral
mineral
Gravel or Crushed Stone
Fragmented Aggregate Stone
sedimentary or igneous fragment
Quartz with Mafic/Chlorite Veins
Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining
metamorphic
Copper Ore (Malachite and Azurite stained rock)
Copper-bearing rock with secondary copper carbonates
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Desert Rose (Baryte or Selenite variant)
Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions
mineral
Quartz Vein in Metamorphic Rock
Quartz-veined Schist or Gneiss
metamorphic
Granite Pebble
Intrusive Igneous Rock
igneous
Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
Quartzite with Schist layers
Metamorphosed Quartz-rich Rock (Mixed Schist/Quartzite)
metamorphic
Yellow Agate (Banded Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Vuggy Quartz on Matrix
Crystalline Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Quartz Geode
Silicon dioxide (SiO2)
sedimentary
Gravel and Sediment Sample
Mixed clastic sediment
sedimentary
Weathered granite or granitic gneiss
Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded
igneous
Geode
Quartz / Chalcedony nodule
sedimentary
Granite
Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)
igneous
Quartz Geode
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Milky Quartz with Chlorite Schist Inclusions
Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)
metamorphic
Wishing Stone (Quartz Vein in Greywacke / Basalt)
Quartz vein in host rock (e.g. Meta-basalt or Greywacke)
metamorphic
Gravel
Unconsolidated rock fragments / detrital sediment
sedimentary
Granite Pebble with Quartz Vein
Granite (Plutonic Igneous Rock) with Quartz (SiO2)
igneous
Unidentified rock fragments
Indeterminate; likely a weathered, iron-stained silicate rock
mineral