Mineral, Part Of A Rock

Vesicular Basalt

Vesicular Basalt

Unidentified dark mineral/rock fragment

Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral

Sandstone with Iron Banding

Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Granite

Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)

Quartz Geode

Silicon Dioxide (SiO2)

Copper Ore (Malachite and Azurite stained rock)

Copper-bearing rock with secondary copper carbonates

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Basalt with Quartz Vein

Extrusive Igneous Rock / Volcanic Rock

Gravel and Sediment Sample

Mixed clastic sediment

Weathered granite or granitic gneiss

Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded

Desert Rose (Baryte or Selenite variant)

Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions

Green Tourmaline

Elbaite (part of Tourmaline group), Na(Li1.5Al1.5)Al6Si6O18(BO3)3(OH)4

Gravel

Unconsolidated rock fragments / detrital sediment

Vuggy Quartz on Matrix

Crystalline Silicon Dioxide (SiO2)

Geode

Quartz / Chalcedony nodule

Quartz Geode

Silicon dioxide (SiO2)

Veined Quartzite / Vein-filled Sedimentary Rock

Siliciclastic rock with iron oxide-filled fractures

Yellow Agate (Banded Chalcedony)

Silicon Dioxide (SiO2)

Quartz Geode

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble

Quartzite (mostly SiO2)

Milky Quartz with Chlorite Schist Inclusions

Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)

Granite

Intrusive Igneous Rock

Pink quartz bead strand (likely rose quartz or pink dyed quartz)

Quartz, silicon dioxide (SiO₂); probable rose quartz variety, possibly dyed or treated quartz/chalcedony

Sandstone

Arenite (SiO2 dominant)

Copper-bearing Quartz Vein in Host Rock

Quartz with Malachite/Chrysocolla staining

Vesicular Basalt (Lava Rock)

Vesicular Basalt

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg3Si2O5(OH)4)

Sandstone and Conglomerate pebbles

Sedimentary clastic rock

Quartz (Clear/Smoky Geode fragment)

Silicon Dioxide (SiO2)

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

Quartz Vein in Basalt or Mafic Rock

Silicon Dioxide (SiO2) vein in volcanic/mafic matrix

Sandstone with Manganese Dendrites

Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)

Blue Tiger's Eye

Crocidolite (fibrous riebeckite) silicified to Quartz (SiO2)

Sandstone

Sandstone (clastic sedimentary rock)

Note: No specimen visible

Quartz (Druzy)

Silicon Dioxide (SiO2)

Sandstone

Quartz Sandstone (predominantly)

Sandstone (Micaceous)

Clastic Sedimentary Rock (primarily SiO2 with Mica)

Sandstone

Arenite (primarily SiO2)