Where is Turquoise with Pyrite found?
Turquoise (CuAl6(PO4)4(OH)8·4H2O) with Pyrite (FeS2)
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Open the appTurquoise with Pyrite 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 Turquoise with Pyrite
Southwestern United States (Arizona, Nevada, New Mexico)
Historically significant and currently active turquoise mining regions, particularly known for high-quality turquoise with various matrix inclusions, including pyrite. Examples include the Kingman mine (Arizona) and the Lone Mountain mine (Nevada).
Iran (Nishapur)
One of the oldest and most renowned sources of fine turquoise, often found with a spiderweb matrix that can include pyrite.
China (Hubei province)
A significant producer of turquoise, with some deposits yielding material containing pyrite inclusions.
Chile
Associated with large porphyry copper deposits, some turquoise occurrences may contain pyrite.
Collecting tips
- Geological Context. Look for areas with evidence of past or present copper mineralization, particularly in arid or semi-arid regions with altered volcanic or sedimentary rocks. Turquoise often forms in veins, nodules, or as crusts in fractures.
- Associated Minerals. Turquoise is commonly found with limonite, kaolinite, chalcedony, and other secondary copper minerals. The presence of pyrite indicates a specific redox condition during formation.
- Visual Identification. Identify the characteristic blue-green color of turquoise and the distinct metallic, brassy-yellow luster of pyrite inclusions. The contrast is usually quite evident.
- Hardness Test. Turquoise has a Mohs hardness of 5-6, while pyrite is 6-6.5. This difference can be subtle but may be noticeable if testing individual components.
Quick Check
- Color:
- Blue-green (turquoise) with brassy-yellow (pyrite) inclusions.
- Luster:
- Waxy to subvitreous (turquoise) and metallic (pyrite).
- Streak:
- Turquoise: White to pale blue-green. Pyrite: Greenish-black to brownish-black.
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