Mudstone
Lutylite (group of fine-grained sedimentary rocks)
sedimentary
Category
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Browse this image does not display a rock, mineral, or geological specimen. it shows a human hand wearing a ring. specimens identified by the Rock Identifier community.
Banded Agate (specifically Black Sardonyx/Onyx variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Jasper (specifically Chert/Ironstone)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Gneiss (with Quartzite and Biotite)
Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)
metamorphic
Limonite (Ironstone)
Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - Carnelian variety of Chalcedony
mineral
Dyed Pumice
Vesicular Rhyolite (Artificial Coloration Addition)
igneous
Dragon Stone (Dragon Blood Jasper)
Epidote with Pietersite or Red Jasper inclusions (varied SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Smoky Quartz
Quartz (SiO₂)
Mineral
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Chalcedony (Grey/White Agate)
Silicon Dioxide (SiO₂)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe/Chlorite)
mineral
Chalcedony (Agate/Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Botryoidal Chalcedony (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Peridot (likely, given the color and bead form)
Olivine, variety Peridot (Mg,Fe)2SiO4
Mineral
Gold
Native Gold (Au)
mineral
Pearl
Calcium Carbonate (Aragonite or Calcite) and Conchiolin
Mineraloid
Botryoidal Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Synthetic Blue Aura Quartz
Silicon Dioxide (SiO2) with Metallic Infusion
mineral (synthetic/man-made coating)
Dalmatian Stone (Dalmation Jasper)
Aplite with Arfvedsonite inclusions
igneous
Carnelian (Banded Agate)
Carnelian Chalcedony (SiO2)
mineral
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO₂)
mineral
Chert (specifically Jasper/Carnelian variety)
Microcrystalline quartz (SiO2)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions of Chlorite, Manganese, or Iron
mineral
Banded Chalcedony (Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Granite
Granitoid
igneous
Pink Quartzite
Metamorphosed Quartz Arenite (SiO2)
metamorphic
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary occurrence
Dyed Blue Agate
Cryptocrystalline Quartz (SiO2)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Gneiss
Gneiss
metamorphic
Green Fluorite (Beaded)
Fluorite (Calcium Fluoride, CaF2)
mineral
Chert (often called Flint when in chalk or limestone)
Silicon Dioxide (SiO₂)
sedimentary
Jasper (specifically Picture Jasper or Landscape Jasper)
Silicon Dioxide (SiO2) - Opaque variety of Chalcedony/Quartz
sedimentary
Petrified Wood
Silicified Wood (primarily SiO₂)
sedimentary
Petrified Wood
Silicified wood (Quartz variant, SiO2)
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities and natural radiation
mineral
Chert (Jasper-bearing)
Microcrystalline silica (SiO2) with iron oxide inclusions
sedimentary
Fluorite (likely Fluorite on Quartz/Matrix)
Calcium Fluoride (CaF2)
mineral
Opalite
Man-made Synthetic Glass (Silicon Dioxide with metal additives)
mineral