Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Category
Man Made Material (Simulated Mineral)
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Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (Arenite)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Likely polished basalt with pale mineral inclusions
Basalt; inclusions possibly calcite, quartz, or weathered feldspar
igneous
Olivine (Peridotite)
Magnesium iron silicate (Mg, Fe)2SiO4
igneous
Blue calcite (probable)
Calcite — CaCO₃
mineral
Shark Tooth Fossil
Carcharhiniformes or Lamniformes (order level fossil)
fossil
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2 with minor Fe2O3)
sedimentary
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Titanium Quartz (Aura Quartz)
Silicon Dioxide (SiO2) treated with Titanium
mineral
Quartz-rich metallic sulfide ore (probable pyrite-bearing rock)
Pyrite, FeS₂, in a quartz-rich host; exact identification is uncertain from the image
mineral
Sandstone (Red/Brown Sandstone pebble)
Arenite (SiO2 dominated sandstone)
sedimentary
Blue calcite (probable)
Calcite, calcium carbonate (CaCO₃)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz with Iron Oxide Staining (Citrine-like Quartz)
Silicon Dioxide (SiO2)
mineral
Rhodonite
Rhodonite (MnSiO3)
mineral
Petrified Wood
Silicified wood (Quartz pseudomorph after wood)
fossil
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Green Turban Shell (Polished)
Turbo marmoratus (Aragonite/Calcite)
mineral
Smoky Quartz
Smoky Quartz (SiO2)
Mineral
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Amethyst
Amethyst (Silica mineral, SiO2)
mineral
Fossilized bivalve shell fragment
Fossil Mollusca, likely a bivalve (class Bivalvia); exact genus cannot be determined from the image
fossil
Polished carnelian jasper / brecciated jasper
Microcrystalline quartz (SiO₂), chalcedony with iron-oxide pigments and opaque jasper fragments
gemstone
Rough amber-like brown mineral specimen
Uncertain from photograph; possibly iron-stained quartz, common opal, or resinous amber
mineral
Limonite (Bog Iron)
Limonite (Hydrated iron(III) oxide-hydroxide) - FeO(OH)·nH2O
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Red Sandstone
Arenic rock (composed mainly of SiO2 with Fe2O3)
sedimentary
Serpentine
Serpentinite (rock) containing serpentine minerals (e.g., Antigorite, Lizardite, Chrysotile)
Metamorphic rock
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ocean Jasper
Orbicular Jasper, Chalcedony (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Rounded basalt pebble
Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with minor olivine or magnetite
igneous
Travertine
Travertine (CaCO3)
sedimentary
Septarian Nodule (Pebble)
Septarian concretion (composition: CaCO3, calcite, aragonite, and clay/mudstone)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral