Where is Epidote in Quartz found?
Ca2(Al,Fe)3(SiO4)3(OH) in SiO2
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Open the appEpidote in Quartz occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Epidote in Quartz
Austria
Significant deposits, particularly in the Knappenwand area, Hohe Tauern, known for well-formed epidote crystals in quartz.
Norway
Various localities produce epidote in quartz, often associated with metamorphic terrains.
United States
California (e.g., Sierra Nevada), Alaska, and other western states have occurrences in metamorphic and hydrothermally altered rocks.
Mexico
Known for some occurrences, often associated with skarn deposits.
Pakistan
Certain regions yield attractive specimens, particularly in pegmatitic and metamorphic environments.
Collecting tips
- Geological Context. Look for areas with evidence of regional or contact metamorphism, especially where mafic igneous rocks or calcareous sediments have been altered. Skarn deposits are also prime locations.
- Vein Systems. Epidote in quartz often forms in hydrothermal veins. Examine quartz veins cutting through host rocks for green inclusions.
- Associated Minerals. Epidote is commonly associated with actinolite, tremolite, garnet, calcite, and various feldspars. The presence of these minerals can indicate a favorable environment.
- Color and Hardness. The distinctive green color of epidote against the harder quartz matrix is a key visual identifier. Test hardness to confirm quartz (7 on Mohs) and epidote (6-7 on Mohs).
Quick Check
- Color:
- Pistachio-green to dark green epidote inclusions in colorless, white, or milky quartz.
- Luster:
- Vitreous to resinous for epidote, vitreous for quartz.
- Streak:
- White to grayish-white for epidote; quartz has no streak.
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