Moss Agate

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Physical & Optical Properties

Mohs Hardness 6,5 – 7,0
Specific Gravity 2,58 – 2,64
Refractive Index 1,53 – 1,54
Crystal System Trigonal
Cleavage None
Color various
Pleochroism Absent

Mohs Hardness

Mohs Hardness: 6,5 – 7,0
1 Soft10 Hard

Crystal System

a a a Trigonal (Rhombohedral) a = b = c, α = β = γ ≠ 90°

Value & Market

Price Tier Moderate ($50-500/ct)

About Moss Agate

Moss agate is a variety of chalcedony (microcrystalline quartz) containing green, red, brown, or black dendritic (tree- or moss-like) inclusions of chlorite, hornblende, or manganese/iron oxides that create landscape or botanical patterns resembling moss, ferns, or forests within the translucent white to gray stone. It forms in weathering and hydrothermal environments, with notable sources in India, the United States (Montana, Wyoming), Australia, and Brazil. Long associated with nature spirits and agricultural fertility in various folk traditions, moss agate is fashioned into cabochons, beads, and carvings.

Jewelry Use

Durability 6/10

Science FYI Family

Frequently Asked Questions

What is Moss Agate?
Moss agate is a variety of chalcedony (microcrystalline quartz) containing green, red, brown, or black dendritic (tree- or moss-like) inclusions of chlorite, hornblende, or manganese/iron oxides that create landscape or botanical patterns resembling moss, ferns, or forests within the translucent whi
What is the hardness of Moss Agate?
Moss Agate has a Mohs hardness of 6.5 to 7.0, making it moderate for use in jewelry.
What color is Moss Agate?
Moss Agate is primarily Various.
How much does Moss Agate cost?
Moss Agate falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Moss Agate?
Moss Agate belongs to the Trigonal crystal system.

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