Moss Opal

Q: What is Moss Opal?

Moss opal is a type of common opal containing moss-like or dendritic inclusions of iron oxide, manganese oxide, or chlorite that create green, brown, or black botanical patterns within an opaque to translucent white, gray, or colorless opal matrix. It differs from precious opal in having little to n

Q: What is the hardness of Moss Opal?

Moss Opal has a Mohs hardness of 5.5 to 6.5, making it moderate for use in jewelry.

Q: How much does Moss Opal cost?

Moss Opal falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.

Q: What is the crystal system of Moss Opal?

Moss Opal belongs to the Amorphous crystal system.

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Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 5.5 – 6.5

Specific Gravity 1.98 – 2.5

Refractive Index 1.37 – 1.52

Crystal System Amorphous

Cleavage None

Fracture Conchoidal,Splintery

Color white

Pleochroism Absent

Mohs Hardness

Mohs Hardness: 5.5 – 6.5

1 Soft10 Hard

Crystal System

Value & Market

Price Tier Budget (< $50/ct)

Where to Buy Moss Opal

Blue Nile Fine jewelry retailer

James Allen Gemstone jewelry

Brilliant Earth Ethically sourced gems

Amazon Wide selection

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About Moss Opal

Moss opal is a type of common opal containing moss-like or dendritic inclusions of iron oxide, manganese oxide, or chlorite that create green, brown, or black botanical patterns within an opaque to translucent white, gray, or colorless opal matrix. It differs from precious opal in having little to no play-of-color, with its appeal lying in the naturalistic landscape and botanical patterns visible in the stone. Sources include Nevada (USA), Mexico, and Peru, and it is used in affordable cabochons and collector carvings.