Scapolite | Gemopedia

Scapolite's name is derived from Greek words meaning "rod" or "shaft" and "stone," which describes the shape of its crystals. Originally discovered in 1913 in the Mogok stone tract of upper Burma, scapolite has been found in many locations. However, it is typically found only in small pockets, leading to its status of rarity in the gemstone world. Scapolite is a mineral group of colorless, or translucent pink, orange, yellow, green, blue, violet or purple gemstones.
Alternate
Names
Marialite, Wernerite, Mizzonite, Meionite
Colors
Colorless, Pink, Orange, Yellow, Yellowish Green (Rare), Blue, Violet, Violet-Blue, Purple, Rarely Red

Scapolite Classification

Common Name

Scapolite

Species

Scapolite

Variety

Colors

Colorless, Pink, Orange, Yellow, Yellowish Green (Rare), Blue, Violet, Violet-Blue, Purple, Rarely Red

Alternate Names

Marialite, Wernerite, Mizzonite, Meionite

Gemstone Groups

Key Separations

RI, birefringence, optic character and possible fluorescence. Uniaxial negative nature is the key to separate from uniaxial positive amethyst. The birefringence can be key when separating from beryl and labradorite.

Comments

Misnomer: pink moonstoneBirefringence typically 0.004 to 0.020 increases as RI increasesViolet or red stones: birefringence 0.005 to 0.020. Purple to violet stones: RI 1.536 to 1.541 birefringence commonly 0.005, SG: 2.60

Scapolite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.55-1.564
Tolerance:(+0.015/-0.014)

Birefringence

0.004-0.038

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert to strong pink, orange or yellow
LWUV: Inert to strong pink, orange or yellow

CCF Reaction

Pleochroism

Dichroic, moderate to strong, varying shades of body color

Dispersion

Strength: moderate fire Value: 0.017

Comments

Scapolite Chemistry & Crystallography

Chemical Name

sodium or calcium aluminum silicate carbonate chloride

Chemical Formula

Na4Al3Si9O24Cl to Ca4Al6Si6O24(CO3, SO4)

Synthesis

Crystal System

Tetragonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Scapolite Characteristic Physical Properties

Hardness

6-6.5

Streak

White

Specific Gravity

2.6-2.74 Typical:2.68

Toughness

Fair

Inclusions

Scapolite often has hollow tubes or needle like crystals.

Luster

Vitreous

Stability

Fracture

Conchoidal

Cleavage

Good, in two directions

Comments

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