Mineral Side Rock

Greywacke (likely)

Greywacke (a type of sandstone)

Porphyritic Basalt (Drill Core)

Porphyritic Basalt with Plagioclase Phenocrysts

Quartz Geode

Silicon Dioxide (SiO2)

Granite

Intrusive Igneous Rock

Note: No specimen visible

Sandstone

Arenite (clastic sedimentary rock)

Weathered granite or granitic gneiss

Granite; primarily quartz, feldspar, and mica

Gneiss

Foliated Metamorphic Rock (Gneiss)

Granodiorite (Weathered)

Granodiorite

Unidentified pale mineral or rock specimen

Indeterminate; image quality prevents reliable mineral identification

Quartz Geode

Silicon Dioxide (SiO2) within a geode

Sandstone

Arenite

Sandstone

Quartz Arenite / Sedimentary Rock

Iron-rich breccia or weathered ironstone

Goethite–hematite-bearing limonite, possibly with quartz and altered rock fragments

Banded Sedimentary Rock

Sedimentary rock with mineral veins/banding

Sandstone (lithic/greywacke variant)

Clastic sedimentary rock (primarily SiO2 with rock fragments)

Quartz Vein in Basalt or Slate

Hydrothermal quartz vein traversing mafic host rock

Sandstone (Tumbled/River Pebble)

Arenite (composed primarily of SiO2)

Sandstone (Iron-stained)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Orbicular granite (likely rapakivi-type granite)

Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende

Biotite-bearing granite

Granite, composed chiefly of quartz, feldspar, and biotite; exact identification is uncertain from the photo.

Sandstone with Lichen and Iron Oxide Staining

Quartz Arenite / Sandstone

Likely garnet-bearing rock (possibly almandine garnet in matrix)

Garnet, likely almandine (Fe₃Al₂Si₃O₁₂); host rock cannot be determined from the image

Likely serpentine

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximate formula Mg₃Si₂O₅(OH)₄

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone (Ferruginous)

Arenite (SiO2 with iron oxide impurities)

Sandstone (Quartzose)

Arenite (SiO2 based typically)

Mixed gravel and small stones

Unsorted gravel; individual clasts are not identifiable from the image

Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)

Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein

Greenstone, likely altered basalt

Metabasalt (chlorite–actinolite–epidote assemblage), likely greenschist-facies greenstone

Sandstone

Arenite (SiO2 based)

Shale

Clastic Sedimentary Rock

Sandstone

Sedimentary Rock (Quartz arenite)

Mixed Mineral Assortment (Pyrite, Kyanite, Agate, Jasper)

FeS2 (Pyrite), Al2SiO5 (Kyanite), SiO2 (Agate/Jasper)

Sandstone

Arenite (SiO2 primarily)

Possible iron-rich pebble with a weathered inclusion

Unidentified; image alone does not support a reliable mineral or rock identification

Conglomerate

Lithified, poorly sorted gravel; composition is uncertain from the image

Smooth gray pebbles

Unidentified rounded rock fragments; composition cannot be determined from the image

Sandstone

Arenite

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Granite

Phaneritic plutonic rock (SiO2 rich)

Educational Geologic Collection

Mixed Mineral and Rock Collection (Various compositions)