Mineral, Specifically A Rock Fragment

Unidentified Rock Fragment

Unknown

River Pebble

Lithified rock fragment (variable composition)

Quartz Druzy (Geode Fragment)

Silicon Dioxide (SiO2)

Quartz (Druzy/Macro-crystalline)

Silicon Dioxide (SiO2)

Thunderegg (specifically a Jasper/Agate-filled Geode nodule)

Silicon Dioxide (SiO2) within Rhyolitic Matrix

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Granite fragment

Granite

Likely raw mica-bearing mineral fragment

Possibly biotite mica or a biotite-rich metamorphic fragment; identification is limited by the dark, blurred image

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Likely weathered iron-rich rock or mineral fragment

Indeterminate; possibly limonite/goethite-rich material with quartz or feldspar

Weathered granite fragment

Granite, predominantly quartz–feldspar–mica rock

Glacial Cobble with Granite Inclusion

Porphyritic Basalt or Andesite containing Granitic Xenolith

Gravel / Limestone Fragment

Calcium Carbonate (CaCO3) / Fine-grained Sedimentary Rock

Weathered metallic sulfide-bearing rock, possibly chalcopyrite ore

Likely chalcopyrite (CuFeS₂) in a weathered host rock; identification is uncertain from the photograph

Quartz Crystal

Silicon Dioxide (SiO2)

Likely translucent quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz

Agate Geode

Banded Chalcedony (Silicon Dioxide, SiO2) with Quartz crystals

Weathered granite fragment

Granite; chiefly quartz (SiO₂), feldspar, and mica

Conglomerate

Clastic Sedimentary Rock

Granite or Quartzite fragment

Granite / Quartzite

Sandstone and Conglomerate pebbles

Sedimentary clastic rock

Sandstone Concretion (Omar or Nut Rock)

Sedimentary Concretion (specifically an 'Omarolluk' or Omar)

Orbicular Granite

Orbicular Granidiorite / Plutonic Igneous Rock

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Hydrothermal Quartz Breccia

Hydrothermal Breccia with Quartz and Chloritic/Epidote Clasts

Vesicular Basalt (or Scoria)

Extrusive Igneous Rock (Mafic)

Weathered rock fragment, possibly granite or metamorphic stone

Indeterminate; likely quartz–feldspar–mica aggregate (granite-like), but image resolution prevents reliable identification

Likely iron-stained quartz or feldspar fragment

Quartz (SiO₂) or potassium feldspar (KAlSi₃O₈), uncertain from image

Possible weathered sandstone or iron-rich sedimentary rock

Indeterminate; likely quartz-rich sandstone with iron-oxide cement

Obsidian

Obsidian (volcanic glass)

Granite Pebble

Granite (Plutonic Igneous Rock)

Gravel

Unconsolidated rock fragments / detrital sediment

Weathered granitic rock fragment

Likely granite or granodiorite, composed mainly of quartz, feldspar, and mica

Milky quartz (quartz-rich rock fragment)

Quartz, silicon dioxide (SiO₂)

Dalmatian Stone

Dalmatian Jasper (Aplite rock composition)

Gneiss (specifically Banded Gneiss)

Gneiss

Rounded river pebble

Indeterminate; likely quartz-rich sandstone, chert, or weathered volcanic rock

Unidentified weathered rock fragment

Likely granitic or feldspathic rock; exact identification requires clearer imaging and testing

Weathered granite or granodiorite fragment

Granite–granodiorite, chiefly quartz, feldspar, and dark biotite/amphibole