Weathered granite or granitic gneiss pebble
Granite; primarily quartz, potassium feldspar, plagioclase, and mica
igneous
Category
Mineral, Part Of A Rock
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Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Veined Pebble (Quartz/Calcite Veined Metamorphic/Sedimentary Rock)
Quartz / Calcite Veined Fault Breccia or Metamorphic Pebble
metamorphic
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
River Cobble (Weathered Granitoid)
Granodiorite / Quartz Diorite
igneous
Quartz Vein in Basalt or Slate
Hydrothermal quartz vein traversing mafic host rock
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Shale
Laminated Mudstone (Shale)
sedimentary
Banded Gneiss Pebble
Gneiss (Metamorphic Rock)
metamorphic
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2) with various iron-oxide inclusions
mineral
Hag Stone
Perforated sedimentary rock (typically sandstone or limestone)
sedimentary
Unable to identify - Image contains non-geological items
N/A
Gabbro or Diorite with Quartz/Epidote Vein
Intrusive Igneous Rock (Plutonic)
igneous
Unakite
Epidotized Granite
metamorphic
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Granite
Phaneritic plutonic rock (SiO2 rich)
igneous
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
mineral
Veined Sandstone with Calcite Veins
Sedimentary sandstone with hydrothermal/mineral veins
sedimentary
N/A (This is a digital image of a bar graph)
Digital Data Visualization (Bar Chart)
This is not a rock or mineral
Likely weathered iron-rich breccia or jasper
Silicified iron-oxide breccia; exact identification requires testing
sedimentary
Painted Rock / Geode Specimen
Silicon Dioxide with artificial pigment coating
mineral
Basalt with Quartz/Calcite Veins
Aphanitic Mafic Igneous Rock (Hydrothermal Veined)
igneous
Sandstone with Quartz Vein
Arenite with Crystalline Silica (SiO2)
sedimentary
Vesicular Basalt (Scoria)
Basalt with vesicular texture
igneous
Chert with Quartz Veining
Microcrystalline Silica (SiO2)
sedimentary
Greywacke (likely)
Greywacke (a type of sandstone)
Sedimentary
Glacial Cobble with Granite Inclusion
Porphyritic Basalt or Andesite containing Granitic Xenolith
igneous
Sandstone
Arenite
Sedimentary
Sandstone
Arenite
sedimentary
Banded Sandstone
Arenite (with iron oxide banding)
sedimentary
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Veined Limestone (Micrite) with Quartz/Calcite Veins
Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions
sedimentary
Calcite (or Alabaster, if truly carved)
Calcium Carbonate (CaCO3)
Mineral/Rock
Sandstone
Clastic Sedimentary Rock
sedimentary