Petrified Wood
Silicified Wood (SiO2)
sedimentary
Category
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Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert / Flint Nodule
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Banded Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Sandstone with Iron Oxide Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Petrified Wood
Silicified Wood (SiO2 - primarily Quartz/Chalcedony/Opal)
Mineral/Fossil (Sedimentary context)
Polished orbicular jasper (likely ocean jasper)
Jasper, microcrystalline quartz (SiO₂), colored by iron oxides and other inclusions
mineral
Polished brecciated jasper
Jasper (microcrystalline quartz, SiO₂), likely brecciated and iron-stained
metamorphic
Polished Picasso jasper
Silicified carbonate rock, commonly marketed as Picasso jasper; composition varies and is not a single mineral species
metamorphic
Polished leopard-skin jasper
Jasper, a microcrystalline quartz variety (SiO₂), with iron-oxide and other mineral impurities
sedimentary
Tumbled turquoise
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Red jasper (tumbled)
Jasper, microcrystalline quartz/chalcedony (SiO₂) colored mainly by iron oxides
mineral
Tumbled carnelian (orange-red chalcedony)
Carnelian, a microcrystalline variety of quartz (SiO₂)
gemstone
Tumbled unakite
Unakite (epidote + pink K-feldspar + quartz)
metamorphic
Polished brown jasper
Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich variety
mineral
Tumbled jasper (likely brecciated or orbicular jasper)
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions
mineral
Red jasper (likely tumbled)
Jasper, microcrystalline quartz/chalcedony (SiO₂), colored mainly by iron oxides
mineral
Polished Ocean Jasper (orbicular jasper)
Siliceous microcrystalline quartz/chalcedony, mainly SiO₂, with iron- and manganese-rich inclusions
sedimentary
Orbicular jasper (likely ocean jasper)
Silica-rich microcrystalline quartz/chalcedony with iron-oxide and feldspar inclusions; commonly marketed as Ocean Jasper
mineral
Red jasper (likely rough jasper/chert)
Microcrystalline quartz (SiO₂), commonly colored by iron oxides
mineral
Polished orbicular jasper (likely ocean jasper)
Jasper, a microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions
mineral
Polished/tumbled jasper, likely ocean jasper or brecciated jasper
Jasper: microcrystalline quartz (SiO₂) with iron oxides and other silicate impurities
mineral
Tumbled agate (likely Botswana or fortification agate)
Microcrystalline quartz, SiO₂ (chalcedony with banded impurities)
mineral
Tumbled turquoise-like stone
Likely turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized rugose coral)
fossil
Unakite
Granite (altered hydrothermal)
igneous
Tumbled carnelian (likely orange chalcedony)
Carnelian, a cryptocrystalline variety of quartz; SiO₂, commonly colored by iron oxides
gemstone
Rhodonite
Inosilicate (Manganese Iron Magnesium Calcium Silicate, (Mn,Fe,Mg,Ca)SiO3)
mineral
Petoskey Stone
Hexagonaria percarinata
fossil
Polished banded agate (likely carnelian/onyx variety)
Microcrystalline quartz, SiO₂ (chalcedony with iron-oxide bands)
gemstone
Polished dendritic jasper or agate slab
Microcrystalline quartz (SiO₂), likely jasper with chalcedony and iron/manganese dendrites
mineral
Obsidian (likely snowflake or smoky obsidian fragment)
Volcanic glass; predominantly rhyolitic silica glass (SiO₂-rich)
igneous
Translucent chalcedony (likely agate or common opal)
Microcrystalline quartz, SiO₂; possible hydrated silica opal, SiO₂·nH₂O
mineral
Tumbled agate/chalcedony
Microcrystalline quartz (SiO₂), likely agate or jasper-bearing chalcedony
mineral
Polished brown jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
metamorphic