Where is Diopside in Calcite found?
CaMgSi2O6 (Diopside) in CaCO3 (Calcite)
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Open the appDiopside in Calcite 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 Diopside in Calcite
Adirondack Mountains, New York, USA
Known for various metamorphic minerals, including diopside in marble.
Ontario and Quebec, Canada
Many localities in the Grenville Province yield excellent diopside crystals in calcite.
Italy (e.g., Val Malenco)
Classic localities for diopside, often found in metamorphic rocks.
Myanmar (Burma)
Source of gem-quality diopside, sometimes found in association with calcite.
Pakistan
Various metamorphic terrains yield diopside, including in carbonate matrices.
Collecting tips
- Look for Metamorphic Terrains. Focus on areas known for contact or regional metamorphism of carbonate rocks, especially near igneous intrusions.
- Identify Calcite Matrix. Calcite will effervesce vigorously with dilute hydrochloric acid (HCl). Look for its characteristic rhombohedral cleavage.
- Spot Diopside Crystals. Search for green, prismatic crystals embedded within the calcite. The two distinct cleavages at nearly 90 degrees are a key identifier for diopside.
- Check for Skarn Indicators. Skarn deposits often contain other calc-silicate minerals like garnet, epidote, and tremolite, which can indicate a favorable environment for diopside.
Quick Check
- Color:
- Green (diopside) in white/gray (calcite)
- Luster:
- Vitreous to dull (diopside), Vitreous (calcite)
- Streak:
- White (both diopside and calcite)
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