Rock Identifier

Category

Mineraloid (Cryptocrystalline Quartz)

Browse mineraloid (cryptocrystalline quartz) specimens identified by the Rock Identifier community.

Learn about Mineraloid (Cryptocrystalline Quartz) in the encyclopedia

Chalcedony

Black Onyx

Landscape Agate

Landscape Agate

Tube Agate

Sweetwater Agate

Sweetwater Agate

Frost Agate

Coldwater Agate

Honey Agate

Zebra Agate

Flame Agate

Feather Agate

Cathedral Agate

Cathedral Agate

Chert (likely flint-bearing chert) (Microcrystalline quartz, SiO₂ (chalcedony/quartz aggregate)) — sedimentary

Chert (likely flint-bearing chert)

Microcrystalline quartz, SiO₂ (chalcedony/quartz aggregate)

Chalcedony (Agate/Jasper Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Chalcedony (Agate/Jasper Nodule)

Silicon Dioxide (SiO2)

Chert (or Cryptocrystalline Quartz) (Silicon Dioxide (SiO2)) — sedimentary

Chert (or Cryptocrystalline Quartz)

Silicon Dioxide (SiO2)

Tumbled yellow chalcedony (likely citrine or yellow jasper) (Microcrystalline quartz, SiO₂; exact identification requires testing) — mineral

Tumbled yellow chalcedony (likely citrine or yellow jasper)

Microcrystalline quartz, SiO₂; exact identification requires testing

Polished black stone egg, probably black obsidian (Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements) — gemstone

Polished black stone egg, probably black obsidian

Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements

Tumbled brown chalcedony (likely jasper or agate) (Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining) — mineral

Tumbled brown chalcedony (likely jasper or agate)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining

Jasper (Red/Carnelian Agate) (Silicon Dioxide (SiO2) with Iron Oxide impurities) — mineral

Jasper (Red/Carnelian Agate)

Silicon Dioxide (SiO2) with Iron Oxide impurities

Banded Carnelian (Carnelian (Silicon Dioxide / SiO2)) — mineral

Banded Carnelian

Carnelian (Silicon Dioxide / SiO2)

Agate geode fragment (Banded chalcedony (microcrystalline SiO₂), lining a geode cavity) — mineral

Agate geode fragment

Banded chalcedony (microcrystalline SiO₂), lining a geode cavity

Quartz (Chalcedony/Agate) (Silicon Dioxide (SiO2)) — mineral

Quartz (Chalcedony/Agate)

Silicon Dioxide (SiO2)

Chalcedony (Silicon Dioxide (SiO2)) — mineral

Chalcedony

Silicon Dioxide (SiO2)

Chert Breccia (Brecciated Chert (Microcrystalline Silica)) — sedimentary

Chert Breccia

Brecciated Chert (Microcrystalline Silica)

Quartz Vein in Host Rock (Silicon dioxide (SiO2) veining in silicate matrix) — sedimentary

Quartz Vein in Host Rock

Silicon dioxide (SiO2) veining in silicate matrix

Chert (with Quartz) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (with Quartz)

Microcrystalline Quartz (SiO2)

Quartz Vein in Basalt or Slate (Hydrothermal quartz vein traversing mafic host rock) — metamorphic

Quartz Vein in Basalt or Slate

Hydrothermal quartz vein traversing mafic host rock

Tumbled milky quartz (Quartz (SiO₂), cryptocrystalline-to-massive variety) — mineral

Tumbled milky quartz

Quartz (SiO₂), cryptocrystalline-to-massive variety

Shiva Lingam Stone (Cryptocrystalline Quartz (Jasper/Basalt matrix)) — sedimentary

Shiva Lingam Stone

Cryptocrystalline Quartz (Jasper/Basalt matrix)

Dark flint or chert fragment (Microcrystalline quartz (SiO₂), likely chert/flint) — sedimentary

Dark flint or chert fragment

Microcrystalline quartz (SiO₂), likely chert/flint

Tumbled quartz-rich stone, possibly chalcedony or light sandstone (Quartz (SiO₂) if crystalline; possibly microcrystalline quartz (chalcedony) or quartz sandstone) — mineral

Tumbled quartz-rich stone, possibly chalcedony or light sandstone

Quartz (SiO₂) if crystalline; possibly microcrystalline quartz (chalcedony) or quartz sandstone

Chalcedony Geode (Botryoidal Agate) (Silicon Dioxide (SiO2)) — mineral

Chalcedony Geode (Botryoidal Agate)

Silicon Dioxide (SiO2)

Milky quartz pebble (Quartz (SiO₂), cryptocrystalline to massive variety) — mineral

Milky quartz pebble

Quartz (SiO₂), cryptocrystalline to massive variety

Chalcedony / Agate Pebble (Silicon Dioxide (SiO2)) — mineral

Chalcedony / Agate Pebble

Silicon Dioxide (SiO2)

Polished chalcedony (likely moss or dendritic agate) (Microcrystalline quartz, SiO₂, with iron/manganese oxide inclusions) — mineral

Polished chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron/manganese oxide inclusions

Red Jasper (Silicon Dioxide (SiO2) with Hematite inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Chalcedony in Matrix (Silicon Dioxide (SiO2)) — mineral

Chalcedony in Matrix

Silicon Dioxide (SiO2)

Fancy Jasper (Silicon Dioxide (SiO₂)) — sedimentary

Fancy Jasper

Silicon Dioxide (SiO₂)

Red Jasper (Silicon Dioxide (SiO2) with Hematite impurities) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Moss Agate (Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide) — mineral

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide

Carnelian (Carnelian (Silicon Dioxide - SiO2)) — mineral

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Blue Chalcedony (Agate) (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony (Agate)

Silicon Dioxide (SiO2)

Quartz-veined Metamorphic Pebble (Silicate-rich metamorphic rock with quartz veins (SiO2)) — metamorphic

Quartz-veined Metamorphic Pebble

Silicate-rich metamorphic rock with quartz veins (SiO2)

Chrysoprase (Nickel-bearing Chalcedony (SiO2 with Ni impurities)) — mineral

Chrysoprase

Nickel-bearing Chalcedony (SiO2 with Ni impurities)

Chert (Flint) (Microcrystalline / Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Red cabochon gemstone, likely carnelian or red agate (Cryptocrystalline quartz (chalcedony), SiO₂) — gemstone

Red cabochon gemstone, likely carnelian or red agate

Cryptocrystalline quartz (chalcedony), SiO₂

Blue Lace Agate Geode Nodules (Chalcedony (cryptocrystalline Quartz, SiO2)) — mineral

Blue Lace Agate Geode Nodules

Chalcedony (cryptocrystalline Quartz, SiO2)

Chert Arrowhead (Projectile Point) (Chert (Cryptocrystalline Quartz, SiO2)) — sedimentary

Chert Arrowhead (Projectile Point)

Chert (Cryptocrystalline Quartz, SiO2)

Chert (Arrowhead/Projectile Point) (Chert (Cryptocrystalline Quartz, SiO2)) — sedimentary

Chert (Arrowhead/Projectile Point)

Chert (Cryptocrystalline Quartz, SiO2)

Banded Chert (Sedimentary Cryptocrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Sedimentary Cryptocrystalline Quartz (SiO2)

Yellow Chert (River Pebble) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Yellow Chert (River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Green Banded Agate (Cryptocrystalline microcrystalline Quartz (SiO2)) — sedimentary

Green Banded Agate

Cryptocrystalline microcrystalline Quartz (SiO2)

Chert (variations include Flint or Jasper) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint Nodules) (Sedimentary cryptocrystalline quartz (SiO2)) — sedimentary

Chert (Flint Nodules)

Sedimentary cryptocrystalline quartz (SiO2)