Gneiss
Gneiss
metamorphic
Category
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Weathered basalt (likely altered basalt)
Basalt, chiefly plagioclase feldspar and pyroxene, with possible chlorite/epidote alteration
igneous
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
igneous
Gravel and Sand Aggregate
Unconsolidated Clastic Sediment
sedimentary
Conglomerate
Conglomerate Rock
sedimentary
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
Weathered mineralized rock fragment
Indeterminate; likely quartz–feldspar-rich lithic material with iron-oxide staining
mineral
Honey calcite (likely rough cleavage fragment)
Calcite, calcium carbonate (CaCO₃)
mineral
Granite
Felsic intrusive igneous rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Conglomerate (or Breccia / Porphyry)
Clastic Sedimentary Rock (Conglomerate / Sandstone)
sedimentary
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Quartz-veined Basalt or Diabase Pebble
Igneous rock with hydrothermal quartz vein
igneous
Unakite
Epidotized Granite
metamorphic
Quartz (Druzy or Chalcedony variant)
Silicon Dioxide (SiO2)
mineral
Sandstone (Weathered Pebble)
Sedimentary Rock (Quartz arenite)
sedimentary
Basalt with Quartz/Calcite Veins
Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)
igneous
Mixed River Pebbles (including Unakite and Jasper)
Polymineralic geological specimens
igneous and sedimentary
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Vein in Host Rock
Hydrothermal Quartz (SiO2) in Slates/Schists
metamorphic
Wavellite with Quartz
Al3(PO4)2(OH,F)3 & SiO2
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (with Concretion)
Arenite / Quartzose Sandstone
sedimentary
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Weathered iron-rich rock, possibly laterite or limonite-bearing quartzite
Limonite/goethite mixture, commonly FeO(OH)·nH₂O, with possible quartz and iron oxides
mineral
Sandstone (Quartzose)
Arenite (SiO2 based typically)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Shale
Shale (clastic sedimentary rock composed of silt and clay-sized particles)
sedimentary
Basalt with Vesicles
Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)
igneous
Small pale rock fragment
Indeterminate; possibly quartz, calcite, or a weathered feldspar-rich fragment
mineral
Rough Apatite in Matrix
Fluorapatite / Chlorapatite / Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Dark gray fine-grained rock fragment
Likely basalt (possibly andesite); exact identification is limited by the photograph
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous