Dalmatian Stone
Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)
igneous
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
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Raw Sapphire / Corundum
Corundum (Al2O3 - Aluminium oxide)
mineral
Shungite
Non-crystalline carbon (allotrope of carbon)
metamorphic
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Limonite streaks)
sedimentary
Mica (Muscovite or Biotite)
Sheet silicate mineral group (e.g., KAl2(AlSi3O10)(F,OH)2)
mineral
Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
mineral
Fossilized Shark Tooth
Selachimorpha fossil
fossil
Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Mineral, potentially a rock with chalcedony/jasper.
Blue Chalcedony and Picture Jasper Beads
Blue Chalcedony (SiO2), Picture Jasper (SiO2)
Mineral
Basalt with Xenolith
Extrusive Igneous Rock containing Mantle Xenolith
igneous
Fossilized Shark Tooth
Elasmobranchii (various species, possibly Carcharias or Odontaspis)
fossil
Green Aura Quartz (Titanium treated Kyanite or Quartz)
Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating
mineral (man-made aura treatment)
Schist (Oxidized)
Mica Schist with Iron Oxide staining
metamorphic
Aura Quartz (Anomalously Coated Quartz)
Silicon Dioxide (SiO2) treated with vaporized metals
mineral
Conglomerate
Clastic Sedimentary Conglomerate (SiO2 primarily)
sedimentary
Basalt Porphyry
Porphyritic Basalt
igneous
Basalt with Amygdaloidal Infilling
Porphyritic or Amygdaloidal Basalt
igneous
Quartz (Iron-Stained or Milky)
Silicon Dioxide (SiO2)
mineral
Polished labradorite cabochon
Labradorite, a plagioclase feldspar: (Ca,Na)(Al,Si)₄O₈
mineral
Schist
Mica Schist (Metamorphic rock)
metamorphic
Diamond
Diamond (C)
Mineral
Amethyst or Smoky Quartz Geode Slice
Crystalline Silicon Dioxide (SiO2) with iron impurities
mineral
Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)
Chalcedony (SiO2), Jasper (SiO2 with impurities)
Mineral (specifically a cryptocrystalline variety of Quartz)
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Banded Gneiss
Gneiss (pronounced 'nice')
metamorphic
Epidote
Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Porphyritic Basalt
Basalt (porphyritic texture)
igneous
Quartz Fragment
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Vesicular Basalt
Basalt (Mafic volcanic rock)
igneous
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Polished brown gemstone, likely smoky quartz
Smoky quartz (quartz, SiO₂), possibly brown chalcedony or tiger’s-eye based on the photograph
gemstone
Dalmatian Stone
Dalmatian Jasper / Feldspathic Igneous Rock
igneous
Diamond
Carbon (C)
mineral
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Gravel and Sand Aggregate
Unconsolidated Clastic Sediment
sedimentary
Quartz with Mica
SiO2 (Quartz) with Potassium aluminum silicate (Muscovite)
Mineral
Quartzite with Calcite Accretion
Metamorphosed Quartz Sandstone (SiO2 with CaCO3 coating)
metamorphic
Dragon Vein Agate
Silicon Dioxide (SiO2)
mineral