Sandstone (lithic wacke/conglomerate mix)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Category
Not A Rock (Synthetic Material)
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Sandstone or Mudstone
Sedimentary Rock
sedimentary
Conglomerate
Conglomerate rock
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite or arkose)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based typically)
sedimentary
Biological Bone (Patella/Knee)
Patella (part of the Human Skeletal System)
Organic Structure (Not a Rock)
Sandstone
Arenite (SiO2 based)
sedimentary
Weathered granite or granitic gneiss fragment
Granite, predominantly quartz, feldspar, and dark mica/amphibole
igneous
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Vesicular volcanic rock, likely weathered pumice or scoria
Pumice/scoria; predominantly volcanic glass and feldspar, with possible iron oxides
igneous
Sandstone
Arenite
sedimentary
Basalt (Greenstone/Water-worn Pebble)
Basalt (containing Chlorite/Epidote)
igneous
Not a rock, mineral, or geological specimen
N/A
Chert (and Limestone) River Cobble
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
sedimentary
Greenstone
Metabasalt / Metavolcanic rock
metamorphic
Slate
Metamorphic Pelitic Rock
metamorphic
Slate
Foliated Metamorphic Rock
metamorphic
Gray Granite
Granite (Phaneritic igneous rock)
igneous
Amygdaloidal Basalt with Zeolite/Quartz Infill
Amygdaloidal Basalt (Host: (Mg,Fe)2SiO4 / CaAl2Si2O8; Infill: SiO2 or Na2Al2Si3O10·2H2O)
igneous
Pebble or Cobble (likely composed of sandstone or conglomerate)
Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)
Sedimentary Rock (possibly a conglomerate or coarse-grained sandstone)
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Slate
Slate (Foliated metamorphic rock)
metamorphic
Quartz (Smoky/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Yellow Jade (Quartzite Jade)
Quartzite (SiO2)
gemstone
Banded Gneiss
Gneiss
metamorphic
Leopard Skin Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartzite Pebble
Metamorphic Quartz (SiO2)
metamorphic
Banded Gneiss
Metamorphic Gneiss
metamorphic
Quartz Vein in Hematitic Siltstone
Hydrothermal Quartz (SiO2) in Ferriferous Matrix
metamorphic
Vesicular volcanic rock, likely weathered scoria
Scoria (vesicular basaltic-andesitic volcanic rock), composition approximately plagioclase, pyroxene, and volcanic glass
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Leopard jasper (orbicular jasper)
Silicified volcanic rock, chiefly microcrystalline quartz/chalcedony (SiO₂) with feldspar and iron-oxide inclusions
metamorphic
Banded iron formation fragment (likely hematite–magnetite ironstone)
Banded iron formation; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and microcrystalline quartz (SiO₂)
sedimentary
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Bowling Ball (Brunswick T-Zone Deep Space)
Polyester resin / Polyurethane polymer
Synthetic (not a natural rock)
Jasper and Quartz Breccia
Silicified Breccia (SiO2)
sedimentary