Milk Opal (Porcelain Opal)

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Physical & Optical Properties

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 Milk Opal (Porcelain Opal)

About Milk Opal (Porcelain Opal)

Milk opal, also called porcelain opal, is a common opal variety with a translucent to opaque milky white body color and smooth waxy to vitreous luster, with little to no play-of-color, resembling fine white porcelain or frosted glass. It forms in volcanic and sedimentary environments and is found widely in Mexico, Peru, the United States, and Australia. Milk opal is used in cabochons, beads, and decorative carvings, prized for its clean, luminous white appearance and relatively affordable price.

Jewelry Use

Durability 4/10

Science FYI Family

Frequently Asked Questions

What is Milk Opal (Porcelain Opal)?
Milk opal, also called porcelain opal, is a common opal variety with a translucent to opaque milky white body color and smooth waxy to vitreous luster, with little to no play-of-color, resembling fine white porcelain or frosted glass. It forms in volcanic and sedimentary environments and is found wi
What is the hardness of Milk Opal (Porcelain Opal)?
Milk Opal (Porcelain Opal) has a Mohs hardness of 5.5 to 6.5, making it moderate for use in jewelry.
What color is Milk Opal (Porcelain Opal)?
Milk Opal (Porcelain Opal) is primarily White.
How much does Milk Opal (Porcelain Opal) cost?
Milk Opal (Porcelain Opal) falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Milk Opal (Porcelain Opal)?
Milk Opal (Porcelain Opal) belongs to the Amorphous crystal system.

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