Rock Identifier

Category

Synthetic (Man Made Glass)

Browse synthetic (man made glass) specimens identified by the Rock Identifier community.

Learn about Synthetic (Man Made Glass) in the encyclopedia

Opalite

Goldstone

Zincite

Yttrium Aluminum Garnet

Yttrium Aluminum Garnet

Blue Goldstone

Sideromelane

Lead Feldspar

Black Obsidian

Maskelynite

Obsidian

Tachylite

Map Jasper

Snowflake Obsidian (Volcanic glass containing Spherulites of Cristobalite (SiO2)) — igneous

Snowflake Obsidian

Volcanic glass containing Spherulites of Cristobalite (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Granitoid (Common Granite/Gneiss) (Granitoid (primarily Quartz [SiO2], Feldspar [KAlSi3O8], and Mica)) — igneous

Granitoid (Common Granite/Gneiss)

Granitoid (primarily Quartz [SiO2], Feldspar [KAlSi3O8], and Mica)

Red Quartzite (Quartzite (primarily SiO2 with hematite impurities)) — metamorphic

Red Quartzite

Quartzite (primarily SiO2 with hematite impurities)

Pegmatitic granite, possibly potassium-feldspar-rich (Coarse-grained granite; mainly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), plagioclase, and biotite/hornblende) — igneous

Pegmatitic granite, possibly potassium-feldspar-rich

Coarse-grained granite; mainly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), plagioclase, and biotite/hornblende

Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chert (often called Flint) (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert (often called Flint)

Chert (Microcrystalline Quartz, SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Obsidian (Obsidian (Volcanic Glass, SiO2 + impurity isotopes)) — igneous

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurity isotopes)

Quartz Pebble (Chalcedony/Agate) (Silicon Dioxide (SiO2)) — Mineral

Quartz Pebble (Chalcedony/Agate)

Silicon Dioxide (SiO2)

Milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

Obsidian (black volcanic glass) (Obsidian; primarily amorphous SiO₂-rich rhyolitic glass) — igneous

Obsidian (black volcanic glass)

Obsidian; primarily amorphous SiO₂-rich rhyolitic glass

Milky Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz Vein / Quartzite (Silicon Dioxide (SiO2)) — mineral

Quartz Vein / Quartzite

Silicon Dioxide (SiO2)

Tumbled Quartz (Silicon Dioxide (SiO2)) — mineral

Tumbled Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Fragment

Silicon Dioxide (SiO2)

Quartz with Mica inclusions (Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions) — mineral

Quartz with Mica inclusions

Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — mineral

Quartz pebble

Silicon dioxide (SiO2)

Quartz Vein in Gneiss or Schist (Silicon dioxide (SiO2) within metamorphic host rock) — metamorphic

Quartz Vein in Gneiss or Schist

Silicon dioxide (SiO2) within metamorphic host rock

Milky Quartz Pebble with Hag Stone Feature (Crystalline Silicon Dioxide (SiO2)) — mineral

Milky Quartz Pebble with Hag Stone Feature

Crystalline Silicon Dioxide (SiO2)

Quartz (Raw Chunk) (Silicon Dioxide (SiO2)) — mineral

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Quartz (River Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Quartz Crystal Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Smoky variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Quartz (Silicon dioxide (SiO2)) — mineral

Quartz

Silicon dioxide (SiO2)

Quartz (Silicon dioxide (SiO2)) — Mineral

Quartz

Silicon dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Inclusions (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Iron-stained quartz or quartz-rich rock (Quartz (SiO₂), likely milky quartz with hematite/goethite staining) — mineral

Iron-stained quartz or quartz-rich rock

Quartz (SiO₂), likely milky quartz with hematite/goethite staining

Worn quartz-rich pebble, likely chert or quartzite (Microcrystalline quartz (SiO₂), possibly quartzite) — sedimentary or metamorphic

Worn quartz-rich pebble, likely chert or quartzite

Microcrystalline quartz (SiO₂), possibly quartzite

sedimentary or metamorphic

Tumbled amber-like chalcedony or resinous fossil material (Likely chalcedony (microcrystalline SiO₂), though the appearance could also indicate copal/amber) — gemstone

Tumbled amber-like chalcedony or resinous fossil material

Likely chalcedony (microcrystalline SiO₂), though the appearance could also indicate copal/amber