Ambergris
Ambra grisea
Organic (often found by beachcombers)
Category
Organic (Often Found By Beachcombers)
Browse organic (often found by beachcombers) specimens identified by the Rock Identifier community.
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Chert (with Quartz Vein)
Microcrystalline Quartz (SiO2)
sedimentary
Ambergris
Ambrein (C30H52O Derivative)
Organic (Zoogenic)
Sea Glass
Amorphous Silica (Glass) SiO2
Mineraloid (Man-made origin)
Stiped Slate Beach Pebble
Low-grade Metamorphic Slate with Quartz Vein (SiO2 on Phyllosilicate base)
metamorphic
Garnetiferous Quartzite (Garnet Gneiss Pebble)
Garnet-bearing Quartzite or Quartz-Feldspar Gneiss
metamorphic
Sandstone Pebble with Iron Staining
Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)
sedimentary
Sea Glass (often mistaken for Gemstones)
Amorphous Silica (SiO2) with trace additives
mineraloid
Quartz-veined Basalt
Basalt with Quartz Infill (SiO2 + Fe/Mg Silicates)
igneous
Sea Glass (Kelly Green)
Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)
Anthropogenic specimen (Man-made material)
Bicolor Quartz (Milk Quartz with Slag or Dark Inclusions)
Silicon Dioxide (SiO2) with impurities
mineral
Quartz (Beach Pebble)
Silicon Dioxide (SiO2)
mineral
Riverstone Jasper (Chert variant)
Silicon Dioxide (SiO2)
sedimentary
Sea Glass (Teal/Turquoise)
Amorphous Silica (SiO2) with trace metal oxides
Anthropogenic (Man-made material processed by nature)
Yellow Quartz (Citrine Quartz or Yellow Jasper)
Silicon Dioxide (SiO2) with iron impurities
mineral
Cat's Eye Shell (Shiva Shell)
Operculum of the Turbo petholatus (Tapestry Turban Snail), predominantly Calcium Carbonate (Aragonite)
mineraloid / biogenic specimen
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Fossilized Bone
Vertebrate Fossil Fragment (Calcium Phosphate / Hydroxyapatite)
fossil
Jasper or Agate Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Hag Stone
Perforated Sedimentary Rock (primarily Siltstone or Mudstone)
sedimentary
Piddock bored rock (likely Mudstone or Shale)
Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock
sedimentary
Granite Water-worn Pebble
Granite
igneous
Blue Sea Glass
Amorphous Silica (Anthropogenic glass)
not a rock (man-made origin)
Leland Blue Stone
Anthropogenic Iron Smelting Slag
mineraloid
Jasper
Silicon Dioxide (SiO2) with impurities (mostly Iron Oxides)
Mineral
Sea Glass (Frosted Quartz/Glass)
Amorphous Silicon Dioxide (SiO2)
Mineraloid
Slag Glass
Amorphous Silicate (Man-made)
industrial byproduct
Quartz Vein in Gneiss or Basalt
Milky Quartz (SiO2) within Metamorphic Host Rock
Metamorphic or Igneous with Mineral Inclusion
Chert (Heart-shaped Pebble)
Cryptocrystalline quartz (SiO2)
sedimentary
Blue Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral
Quartz Veined Basalt Pebble
Amygdaloidal Basalt with Quartz (SiO2) veining
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hag Stone (Banded Chert or Limestone with Borehole)
Microcrystalline Quartz (Chert) or Calciferous Siltstone (CaCO3/SiO2)
sedimentary
Sea Glass
Amorphous Silica (Anthropogenic glass) - SiO2
mineral
Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)
Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein
igneous or sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Gold-bearing Quartz
Native Gold (Au) in Quartz (SiO2) matrix
mineral
Flowerstone
Porphyritic Basalt or Porphyritic Andesite
igneous
Fossilized Shark Tooth
Fossilised Chondrichthyes dental specimen (likely Otodus or Carcharias sp.)
mineral
Jasper
Silicon dioxide (SiO2) with iron inclusions
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Septarian Nodule (Dragon Stone)
Septarian Geode (CaCO3 + Mg + Fe)
sedimentary