Moss Agate
Quartz (variety Agate / Chalcedony) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal (Hexagonal) - Microcrystalline; typically occurs as massive, nodular, or tumbled stones
Mineral Group
Silicates (Tectosilicates)
Chemical Formula
SiO2 with impurities of Iron, Manganese, or Chlorite
Formation Process
Hydrothermal; formed in cavities of volcanic rocks or as veins in igneous rocks where mineral-rich silica solutions precipitate
About This Crystal
A translucent to semi-opaque variety of chalcedony with dark green, dendritic, or moss-like inclusions. It features a vitreous to waxy luster and often shows a variety of green shades against a clear, white, or milky base.
Physical Characteristics
Color: Green, white, clear, or grey; Streak: White; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 2.58–2.64; Fluorescence: Variable, sometimes inert or pale yellow under LWUV
Optical Properties
Refractive Index: 1.530–1.540; Doubly refractive; No pleochroism or dispersion; Lacks specific optical phenomena like asterism
Hardness & Durability
Origin Region
India, Brazil, USA (Montana, Michigan), Madagascar, and Uruguay
Hardness & Durability
Mohs Hardness: 6.5–7; Excellent durability and toughness due to its microcrystalline structure; suitable for daily jewelry wear
Care & Maintenance
Safe to clean with warm soapy water and a soft brush; generally resistant to fading, but avoid harsh chemicals and extreme heat
Rarity & Value
Common; value is determined by the complexity of the moss-like patterns and translucency; affordable price range for collectors
Special Characteristics
Dendritic inclusions of manganese or iron oxides create the illusion of botanical growth inside the stone
Lore & History
Historically used as an amulet for agriculture and abundance; in crystal healing tradition, it is associated with heart chakra balancing, grounding, and new beginnings.