Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3)(OH)3(OH))
mineral
Category
Igneous And Metamorphic
Browse igneous and metamorphic specimens identified by the Rock Identifier community.
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Rock Crystal Quartz
Quartz (SiO₂)
Mineral
River Cobble (likely Basalt or Metagraywacke)
Non-specific water-worn lithic fragment
igneous or metamorphic
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Aventurine
Aventurine Quartz (SiO2 with inclusions)
Mineral
Hematite
Hematite (Fe2O3)
mineral
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Moonstone
Adularia (orthoclase feldspar variety)
mineral
Green Aventurine (likely)
Silicon dioxide (SiO2) with fuchsitemica inclusions
Mineral (specifically a variety of Quartz)
Green Aventurine
Aventurine (a variety of Quartz, SiO2 with fuchsite inclusions)
Mineral
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Citrine Quartz
Quartz (SiO2) - specifically, a variety of macrocrystalline quartz
Mineral
Granite or Granitic Gneiss Pebble
Granite (felsic intrusive igneous rock) or Gneiss
Igneous or Metamorphic
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Mineral
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)
Mineral
Snowflake Obsidian and Green Aventurine
Volcanic Glass (SiO2 with Cristobalite inclusions) and Quartz (SiO2 with Fuchsite)
igneous and metamorphic
Granitic Pegmatite Intrusion in Host Rock
Pegmatite dike in amphibolite or schist
igneous and metamorphic
Granite or Granitic Gneiss River Rock
Granite / Gneiss
Igneous or Metamorphic
Glacial Cobbles (predominantly Granite and Gneiss)
Mixed lithologies (Quartz, Feldspar, Mica assemblage)
igneous and metamorphic
Glacially transported granite and gneiss boulders
Granite (quartz–feldspar–mica); banded specimens likely gneiss
igneous and metamorphic
Smoky Quartz
Smoky Quartz (SiO ₂)
Mineral
Pyrite
Pyrite (FeS2)
Mineral
Black Tourmaline (Schorl)
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
mineral
Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)
Calcite
Mineral
Biotite Mica
K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2
Mineral
Aquamarine
Beryl (Be3Al2Si6O18), specifically the blue-green variety
Mineral
Rose Quartz
Rose Quartz (SiO₂)
mineral
Green Aventurine
Aventurine (a variety of Quartz, SiO2)
Mineral
Citrine
Quartz (SiO2) - specifically, a variety of macrocrystalline quartz
mineral
Diopside (likely Chromian Diopside)
Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.
mineral
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Mineral
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral
Smoky Quartz
Quartz (SiO₂)
Mineral
Aventurine (Green Aventurine)
Quartz with Fuchsite Inclusions (SiO2)
Mineral
Rose Quartz
Quartz (SiO2) with trace elements of titanium, iron, or manganese
mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Tourmaline (likely Schorl)
Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4
Mineral
Quartz (likely milky quartz or a stained variety)
Silicon Dioxide (SiO₂)
Mineral
Moonstone
Orthoclase Feldspar (specifically showing adularescence)
Mineral
Green Aventurine
Aventurine (a variety of Quartz, SiO2)
Mineral