$88Median
8Sold (12 mo)
$100Last sale
Moonstone specimens for sale
16 for sale · $140–$5,000 USD
77 in the gallery
Moonstone is a variety of the mineral feldspar that displays a soft, pearly blue sheen known as adularescence. The mineral group is composed of layered potassium aluminum silicates, and Moonstone typically forms in crystal aggregates with a pearly luster that can range from colorless to pale blue or peach, depending on the dominant trace elements and internal structure. Specimens are commonly found as well-formed, tabular crystals or thin, platy aggregates, and the moonlike glow is most vivid when light refracts within the micro-structural layers.
- Formula
- KAlSi3O8
- Rarity
- Common
- Stability
- Stable
- Collector interest
- High Interest
- Classification notes
- Silicate; tectosilicate; framework silicate; feldspar group (orthoclase)
Key characteristics
- Crystal system
- monoclinic
- Mohs hardness
- 6–6.5
- Specific gravity
- 2.55–2.63
- Luster
- vitreous, pearly
- Transparency
- transparent, translucent
- Color
- colorless, white, gray, brown, yellow, orange, green, blue
- Streak
- white
- Cleavage
- perfect
- Fracture
- uneven, subconchoidal
- Crystal habit
- prismatic, tabular, granular, massive
- Gem mineral
- Classic / historic
Buy Moonstone specimens
View all 16Where Moonstone is found
Top localities
- Central St Gotthard Massif5 specimens
- Valenciana Mine5 specimens
- Switzerland3 specimens
- Göscheneralp2 specimens
- Argentière Glacier1 specimen
- Binn Valley1 specimen
- Chihuahua1 specimen
- Griesseren Valley1 specimen
- Pein-Pyit1 specimen
- Pfitsch pass1 specimen
About Moonstone
Notable Moonstone discoveries come from diverse locales such as Mexico, Myanmar, and Norway, where the mineral occurs in igneous and metamorphic settings and in alluvial gravels. Collectors prize Moonstone for its unique interplay of color and sheen, as well as the challenge of locating well-formed crystals with strong adularescence. Its relatively soft hardness and perfect cleavage require careful handling, but the ethereal glow remains a compelling feature for display and study.
