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

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

Botryoidal Chalcedony (Geode fragment)

Silicon Dioxide (SiO2)

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

Chalcedony (Agate / Chert)

Silicon Dioxide (SiO2)

Mixed collection of Quartz varieties, Chalcedony, and metamorphic pebbles (Mixed gemstones (primarily Silicon Dioxide - SiO2)) — mineral

Mixed collection of Quartz varieties, Chalcedony, and metamorphic pebbles

Mixed gemstones (primarily Silicon Dioxide - SiO2)

Tree Agate (Silicon Dioxide (SiO2) with Chlorite inclusions) — mineral

Tree Agate

Silicon Dioxide (SiO2) with Chlorite inclusions

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

Carnelian

Carnelian (Silicon Dioxide, SiO2)

Onyx (Chalcedony (SiO2) with parallel banding) — mineral

Onyx

Chalcedony (SiO2) with parallel banding

Bloodstone (Heliotrope) — Mineral

Bloodstone

Heliotrope

Red Jasper and Green Aventurine (Silicon dioxide (SiO2)) — mineral

Red Jasper and Green Aventurine

Silicon dioxide (SiO2)

Dyed Agate (SiO2) — Mineral

Dyed Agate

SiO2

Polished blue chalcedony or glass-like quartz specimen (Chalcedony (microcrystalline SiO₂), possibly treated or synthetic; exact identification requires testing) — gemstone

Polished blue chalcedony or glass-like quartz specimen

Chalcedony (microcrystalline SiO₂), possibly treated or synthetic; exact identification requires testing

Polished jasper or chert pebble (Microcrystalline quartz (SiO₂), likely iron- and clay-rich jasper/chert) — sedimentary

Polished jasper or chert pebble

Microcrystalline quartz (SiO₂), likely iron- and clay-rich jasper/chert

Yellow chalcedony or citrine-like polished stone (Chalcedony (microcrystalline SiO₂), possibly iron-stained quartz) — mineral

Yellow chalcedony or citrine-like polished stone

Chalcedony (microcrystalline SiO₂), possibly iron-stained quartz

Polished jasper or chert nodule (Microcrystalline quartz (SiO₂), likely iron-stained jasper/chert) — sedimentary

Polished jasper or chert nodule

Microcrystalline quartz (SiO₂), likely iron-stained jasper/chert

Carnelian and White Quartz Bracelet (Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz) — mineral

Carnelian and White Quartz Bracelet

Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz

Druzy Chalcedony (Agate Geode) (Silica (SiO2) - Cryptocrystalline Quartz with druzy macrocrystalline quartz) — mineral

Druzy Chalcedony (Agate Geode)

Silica (SiO2) - Cryptocrystalline Quartz with druzy macrocrystalline quartz

Tumbled gray chalcedony (likely agate or quartzite) (Microcrystalline quartz, SiO₂ (chalcedony)) — mineral

Tumbled gray chalcedony (likely agate or quartzite)

Microcrystalline quartz, SiO₂ (chalcedony)

Banded Agate with Drusy Quartz (Cryptocrystalline Quartz (SiO2) with macrocrystalline Quartz) — mineral

Banded Agate with Drusy Quartz

Cryptocrystalline Quartz (SiO2) with macrocrystalline Quartz

Shiva Lingam (Cryptocrystalline Quartz (Jasper/Agate)) — sedimentary

Shiva Lingam

Cryptocrystalline Quartz (Jasper/Agate)

Tumbled yellowish quartz or chalcedony (Quartz/chalcedony, SiO₂) — mineral

Tumbled yellowish quartz or chalcedony

Quartz/chalcedony, SiO₂

Tumbled yellow chalcedony (likely yellow jasper or citrine-colored quartz) (Microcrystalline quartz, SiO₂; coloration may come from iron oxides or fine inclusions) — mineral

Tumbled yellow chalcedony (likely yellow jasper or citrine-colored quartz)

Microcrystalline quartz, SiO₂; coloration may come from iron oxides or fine inclusions

Mother of Pearl and Onyx (Aragonite (Mother of Pearl) and Chalcedony (Onyx)) — mineral

Mother of Pearl and Onyx

Aragonite (Mother of Pearl) and Chalcedony (Onyx)

Orca Agate (Chalcedony (Microcrystalline Quartz, SiO2)) — sedimentary

Orca Agate

Chalcedony (Microcrystalline Quartz, SiO2)

Tumbled chalcedony (likely pale agate or quartz) (Chalcedony, microcrystalline SiO₂) — mineral

Tumbled chalcedony (likely pale agate or quartz)

Chalcedony, microcrystalline SiO₂

Quartz-veined Granite or Gneiss Pebble (Silicate-rich metamorphic rock fragment) — metamorphic

Quartz-veined Granite or Gneiss Pebble

Silicate-rich metamorphic rock fragment

Chalcedony (Chalcedony (SiO2)) — mineral

Chalcedony

Chalcedony (SiO2)

Banded Chert / Cryptocrystalline Quartz (Silicon Dioxide (SiO2)) — sedimentary

Banded Chert / Cryptocrystalline Quartz

Silicon Dioxide (SiO2)

Chalcedony (Yellow Chert / Agate) (Quartz (Silicon Dioxide - SiO2)) — mineral

Chalcedony (Yellow Chert / Agate)

Quartz (Silicon Dioxide - SiO2)

Agate (Cryptocrystalline quartz, Chalcedony (SiO2)) — mineral

Agate

Cryptocrystalline quartz, Chalcedony (SiO2)

Yellow chalcedony (likely agate) cabochons (Microcrystalline quartz, SiO₂; chalcedony variety, possibly naturally colored or dyed) — gemstone

Yellow chalcedony (likely agate) cabochons

Microcrystalline quartz, SiO₂; chalcedony variety, possibly naturally colored or dyed

Green Onyx (Agate) (Silicon Dioxide (SiO2)) — sedimentary

Green Onyx (Agate)

Silicon Dioxide (SiO2)

Carnelian (Carnelian (SiO2)) — mineral

Carnelian

Carnelian (SiO2)

Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)

Tumbled carnelian (orange chalcedony) (Carnelian, a microcrystalline quartz variety; SiO₂, commonly colored by dispersed iron oxides) — mineral

Tumbled carnelian (orange chalcedony)

Carnelian, a microcrystalline quartz variety; SiO₂, commonly colored by dispersed iron oxides

Carnelian (Orange chalcedony, microcrystalline quartz (SiO₂)) — mineral

Carnelian

Orange chalcedony, microcrystalline quartz (SiO₂)

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

Quartz pebble (Agate / Chalcedony)

Silicon Dioxide (SiO2)

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

Chalcedony (Agate) Pebble

Silicon Dioxide (SiO2)

Tumbled yellow chalcedony (likely yellow jasper or quartz) (Microcrystalline quartz, SiO₂; probable chalcedony/jasper variety) — mineral

Tumbled yellow chalcedony (likely yellow jasper or quartz)

Microcrystalline quartz, SiO₂; probable chalcedony/jasper variety

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

Chalcedony Pebble / Rough Agate

Silicon Dioxide (SiO2)

Polished agate geode (Chalcedony (microcrystalline quartz, SiO₂) with quartz druse crystals) — mineral

Polished agate geode

Chalcedony (microcrystalline quartz, SiO₂) with quartz druse crystals

Yellow chalcedony (likely heat-treated or resin-coated) (Microcrystalline quartz, SiO₂) — mineral

Yellow chalcedony (likely heat-treated or resin-coated)

Microcrystalline quartz, SiO₂

Black Onyx (Silicon Dioxide (SiO2)) — mineral

Black Onyx

Silicon Dioxide (SiO2)

Flint pebble (Chert / Flint (SiO2)) — Sedimentary

Flint pebble

Chert / Flint (SiO2)