Andesine specimens for sale
1 for sale · $150 USD
Andesine is a feldspar mineral with a structure that fits into the plagioclase subgroup. It typically forms pale to pinkish or peach-colored crystals and can exhibit a glassy to sub-optimally vitreous luster. Crystals are commonly tabular to elongated prisms, and in hand specimens the color can range from off-white to warm orange-hued tones, reflecting trace substitutions of calcium and sodium within the crystal lattice.
- Formula
- (Na,Ca)[Al(Si,Al)Si2O8]
- Rarity
- Common
- Stability
- Stable
- Collector interest
- Moderate Interest
- Classification notes
- Feldspar (tectosilicate); framework silicate; plagioclase series
Key characteristics
- Crystal system
- triclinic
- Mohs hardness
- 6–6.5
- Specific gravity
- 2.65–2.69
- Luster
- vitreous, pearly
- Transparency
- transparent, translucent
- Color
- white, gray, yellow, green, red, pink
- Streak
- white
- Cleavage
- perfect
- Fracture
- uneven, conchoidal
- Crystal habit
- tabular, prismatic, granular, massive
- Gem mineral
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About Andesine
Japan is a noted locality for fine andesine specimens, where hydrothermal and igneous environments contribute to well-formed crystals that attract collectors. Internationally, andesine can be found in other pegmatites and metamorphic settings, but the Japanese material is particularly prized for its clarity and color consistency. Collectors value these crystals for their subtle hues and the way they can be paired with related feldspars to illustrate solid-solution trends within the plagioclase series. Andesine shows how trace element chemistry translates into visible variation, making each specimen a quiet study in mineral chemistry as well as a mineralogical delight.