Tumbled banded jasper, likely brecciated jasper
Microcrystalline quartz (SiO₂) with iron-oxide and clay inclusions
mineral
Category
Anthropogenic (Man Made Material Mimicking Sedimentary Rock)
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Pearl-embellished decorative cross
Pearl (biogenic calcium carbonate, predominantly aragonite) with rhinestone-mounted glass or synthetic gemstones
gemstone
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Petrified Wood
Silicified Wood
fossil
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
sedimentary
Polished jasper/chalcedony pebble
Microcrystalline quartz (SiO₂), likely brecciated or iron-stained jasper
mineral
Zebra Jasper
Opaque microcrystalline Quartz (SiO2) with impurities
sedimentary
Rough Chalcedony / Jasper Agate Nodule
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Tumbled pale quartz/chalcedony fragment
Quartz (SiO₂), possibly microcrystalline chalcedony
mineral
Jasper
Silicon dioxide (SiO2)
Mineral/Sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Hag Stone (Flint with natural hole)
Silicon Dioxide (SiO2) - Nodular Chert / Flint
sedimentary
Chert (Chalcedony)
Microcrystalline quartz (SiO2)
sedimentary
Flint or chert
Microcrystalline quartz (SiO₂), commonly with chalcedony
sedimentary
Chert (and Jasper/Flint variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Chert with Druzy Quartz Geode
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Carcharocles or Lamniformes (order)
fossil
Pink calcite (likely)
Calcite — calcium carbonate, CaCO₃
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red Jasper
Microcrystalline Quartz (SiO2) with Hematite impurities
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled orange chalcedony and a gray stone disk
Chalcedony (microcrystalline quartz, SiO₂); disk likely fine-grained sandstone or slate
mineral
Chert / Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Mixed pebble collection, including likely flint, quartzite, and fossil material
Varied silicate rocks; visible specimen may include chert (microcrystalline SiO₂), quartzite, and a possible fossil
sedimentary
Tumbled orange calcite
Calcite (calcium carbonate, CaCO₃)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Agate (Geode/Nodule)
Chalcedony (cryptocrystalline silica, SiO2)
sedimentary
Tumbled carnelian
Carnelian, orange-red variety of cryptocrystalline chalcedony (SiO₂)
gemstone
Jasper
Silicon Dioxide (Microcrystalline Quartz / Chalcedony)
sedimentary
Clear quartz crystal sphere
Quartz (silicon dioxide, SiO₂)
mineral
Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)
Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)
mineral (synthetic)
Glauconite
Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
mineral
Chalcedony (likely common gray chalcedony)
Microcrystalline quartz, SiO₂
mineral
Jasper with Epidote
Silicon Dioxide (SiO2) with Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
sedimentary
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Polished/tumbled calcite
Calcite (calcium carbonate, CaCO₃)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary