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Crushed Indigo Iolite (Cordierite) from India, Coarse Crush, Gravel Size, 4mm - 2mm

Crushed Indigo Iolite (Cordierite) from India, Coarse Crush, Gravel Size, 4mm - 2mm

Regular price $7.50 USD
Regular price Sale price $7.50 USD
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Iolite, also known as cordierite, is a pleochroic mineral that changes from blue to violet-blue depending on the angle of light. It is believed that ancient Viking navigators used thin slices of iolite as filters to help determine the direction of the sun on overcast days (similar to polarized lenses). This particular crushed iolite is from India and has a semi-translucent indigo to violet color. 

Our coarse material is considered to be pea-sized gravel, ranging between 4 millimeters to 2 millimeters. Please see the corresponding sediment size chart.

Mineral Properties

  • Mohs’s Hardness: 7 - 7.5
  • Specific Gravity (g/cm3): 2.54-2.66
  • Luster: Vitreous
  • Color: Indio, Violet-Blue
  • Origin: India

    This product is not man-made, mixed with resin, dyed, or stabilized. Pictures are taken in full sun and material is dry. Size measurements are using the metric system (millimeters), including the metric ruler (cm/mm) as shown in the product photos.

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    • Shipping

      We offer free US shipping on any order over $50. Orders are typically shipped within one to two business days and spend 2-5 days in transit. This means your order should arrive at your doorstep within 4-6 business days -- and often less!

    • Returns

      We offer a hassle-free 30-day return policy. If you wish to return or exchange any product in your order, simply email, and we will help you process the request.


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