Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
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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
Iron-stained quartz-rich rock (possibly ironstone)
Quartz (SiO₂) with iron-oxide/hydroxide staining, likely limonite/goethite
mineral
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Greenschist (or Serpentinite) with Quartz-Feldspar Vein
Metabasalt / Greenschist Facies Rock
metamorphic
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Shale with Quartz Veins
Fissile Sedimentary Rock (SiO2)
sedimentary
Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Shale or Slate with Quartz Veins
Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins
Metamorphic, likely Sedimentary with Quartz veins
Generic Rock Fragment
Rock Fragment
sedimentary
Quartz Vein in Sedimentary Matrix
Silicon Dioxide (SiO2) with host rock
mineral
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Porphyritic Basalt or Porphyritic Andesite
Porphyritic Extrusive Igneous Rock
igneous
River Cobble (Weathered Granitoid)
Granodiorite / Quartz Diorite
igneous
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
River Pebble (likely Quartzite or Chert)
Sedimentary Clast (Silicon Dioxide dominant)
sedimentary
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Small rounded mineral/rock fragment
Indeterminate; possibly quartz-rich stone or feldspar
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Shale
Shale (clastic sedimentary rock)
Sedimentary
Banded Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Basalt (Greenstone/Water-worn Pebble)
Basalt (containing Chlorite/Epidote)
igneous
Greenstone pebble (identification uncertain from photo)
Greenstone, typically metamorphosed mafic rock composed of chlorite, actinolite, and epidote
metamorphic
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Glacial Cobble with Granite Inclusion
Porphyritic Basalt or Andesite containing Granitic Xenolith
igneous
Granite
Intrusive Igneous Rock
igneous
Agated Chert
Microcrystalline Quartz (SiO2)
sedimentary
Biotite Mica Schist
Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2
metamorphic
Granite Pebble
Granite
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Chert with Quartz Veining
Microcrystalline Silica (SiO2)
sedimentary
Greenstone (likely greenschist)
Chlorite–actinolite–epidote-rich metabasalt; mineral proportions cannot be confirmed from the photo
metamorphic
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Coarse-grained granite or granitic pegmatite fragment
Granite; primarily quartz, feldspar, and mica
igneous
Granite
Intrusive igneous rock
igneous
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Veined Pebble (Quartz/Calcite Veined Metamorphic/Sedimentary Rock)
Quartz / Calcite Veined Fault Breccia or Metamorphic Pebble
metamorphic
Granite
Granite
igneous