Basalt (Tumbled Massage Stone)
Extrusive Igneous Rock
igneous
Category
Mineral, Specifically A Rock Fragment
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Red Sandstone
Arenite (primarily quartz with iron oxide cement)
sedimentary
Aggregate Concrete
Anthropogenic Conglomerate (Technosol)
sedimentary
Pink halite (rock salt)
Halite (sodium chloride, NaCl)
mineral
Sandstone (Wonderstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Likely weathered quartz-rich stone or fossil fragment
Indeterminate; possibly quartz-bearing sandstone, iron-stained quartz, or a fragmentary fossil
mineral
Iron-rich sandstone or laterite fragment
Ferruginous sandstone; possibly laterite/goethite-rich ironstone
sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Fossilized Bone Chunk
Permineralized Vertebrate Bone (indeterminant)
fossil
Shale
Lutaceous Rock (Hydrous Aluminum Silicates)
sedimentary
River Stone (Greywacke)
Greywacke (Lithic Sandstone)
sedimentary
Granite Pebble
Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)
igneous
Limestone (specifically fossiliferous/skeletal limestone)
Calcium Carbonate (CaCO3)
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Sandstone
Sedimentary rock composed mainly of sand-sized minerals or rock grains
sedimentary
Basalt
Basalt (composition of plagioclase feldspar and pyroxene)
Igneous
Basalt with Epidote Veining
Basalt (Mafic Extrusive Rock) with Ca2(Al,Fe)3(SiO4)3(OH)
igneous
Fossilized bivalve shell fragment
Fossil Mollusca, likely a bivalve (class Bivalvia); exact genus cannot be determined from the image
fossil
Mica (Biotite and Muscovite) in Matrix
Potassium aluminum silicate with iron/magnesium (KAl2(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(F,OH)2)
igneous
Tumbled epidote or epidote-rich stone
Epidote, Ca₂(Al,Fe)₃(SiO₄)₃(OH); possibly a green jasper or prehnite-epidote aggregate
mineral
Marble
Recrystallized Calcite (CaCO3) Rock
metamorphic
Chert Breccia
Brecciated Chert
sedimentary
Rounded dark river pebble
Likely basalt or fine-grained andesite; exact identification requires testing
igneous
Tumbled citrine or iron-stained quartz
Quartz (SiO₂), likely iron-oxide-stained or natural citrine
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Breccia Pebble
Sedimentary Breccia
sedimentary
Green Chalcedony (likely Green Agate or Chrysoprase)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
sedimentary (man-made/anthropogenic)
Weathered schist or gneiss fragment
Quartz–feldspar–mica metamorphic rock; likely mica schist or gneiss
metamorphic
Agate (Grey Agate Slice)
Microcrystalline Quartz (SiO2)
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Weathered Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Sandstone (Weathered / Crushed)
Quartz Sandstone
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (Quartz Sandstone)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (composed mainly of SiO2)
sedimentary