Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Category
Carved Stone
Browse carved stone specimens identified by the Rock Identifier community.
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Hag Stone (Adder Stone / Geode-bearing Pebble)
Sedimentary Rock with Cavity (often Quartzite, Limestone, or Sandstone)
sedimentary
Mixed River Stones and Minerals
Mixed Silica-rich Stones (Quartz, Agate, Jasper, Sandstone, Dalmation Stone)
sedimentary
Quartzite Cobble
Metamorphic Quartz-rich Rock (SiO2)
metamorphic
Fossilized Coral (Petoskey Stone precursor)
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Gneiss (foliated metamorphic rock)
Gneiss
metamorphic
Basalt River Stone
Basalt (Mafic Igneous Rock)
igneous
Diorite (Dalmatian Stone)
Intermediate Phaneritic Igneous Rock
igneous
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Dalmation Stone
Peralkaline Rock (SiO2 with Arfvedsonite)
igneous
Chinese Writing Stone
Porphyritic Basalt or Andesite with Feldspar phenocrysts (likely Orthoclase or Plagioclase)
igneous
Dalmatian Stone
Dalmatian Jasper (Aplitic Perthite)
igneous
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Citrine Quartz
Silicon dioxide (SiO2)
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si)4O10(F,OH)2)
mineral
Yellow Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Fossil Coral (Petoskey-style Rugose Coral)
Hexagonaria percarinata (Order: Rugosa)
sedimentary
Banded Sandstone (Zebra Stone)
Arenite with Iron Oxide Banding (Liesegang rings)
sedimentary
Asphalt Chunk
Asphalt concrete
man-made composite
Chert (Field Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Diorite river stone
Intermediate Plutonic Igneous Rock (Diorite)
igneous
Basalt River Stone
Basalt (Mafic volcanic rock)
igneous
Chert (Jasper/Quartzite Pebble)
Silicon Dioxide (SiO2)
sedimentary
Fossil Coral
Hexagonaria or similar rugose/tabulate coral fossil (Calcium Carbonate, CaCO3)
fossil
Amazonite
K(AlSi3O8) - Microcline Feldspar
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Citrine
Quartz (Silicon Dioxide - SiO2)
mineral
Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Citrine Geode
Citrine (Silicon Dioxide, SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
igneous
Tumbled zebra stone, likely zebra marble or banded calcite
Zebra marble (recrystallized calcite, CaCO₃), possibly black-and-white banded calcite
metamorphic
Basalt River Stone
Extrusive mafic igneous rock (Basalt)
igneous
Chert (Field Stone)
Chert (SiO2)
sedimentary
Basalt (River Stone)
Basalt
igneous
Tumbled dark stone, likely basalt
Basalt (fine-grained mafic volcanic rock; commonly plagioclase, pyroxene, and minor olivine)
igneous
Black polished/tumbled stone, likely basalt or black jasper
Most likely fine-grained basalt (plagioclase and pyroxene); appearance can also match microcrystalline quartz (black jasper)
igneous
Coral Fossil (Agatized Coral or Petoskey Stone)
Hexagonaria percarinata (if Petoskey) or generally Scleractinia (Agatized Coral)
Sedimentary/Fossil
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Red Sandstone / Mudstone Nodules (L Liesegang rings)
Sedimentary Rock (Quartz/Hematite Clay Mix)
sedimentary