Labradorite
Real mineral · uncommon · (Ca,Na)(Al,Si)₄O₈
A feldspar that displays labradorescence, an iridescent play of colour caused by light interference between thin alternating layers of different compositions within the crystal. Common in basaltic igneous rocks.
Identity
- Formula
- (Ca,Na)(Al,Si)₄O₈
- Chemical class
- silicate
- Mineral group
- Albite, Moonstone, Sunstone
- Also known as
- Spectrolite (Finnish variety), Black moonstone (informal)
Crystallography
- Crystal system
- triclinic
- Habits
- tabular, massive
- Fracture
- uneven
Physical properties
- Mohs hardness
- 6.5
- Density
- 2.7 g/cm³
- Luster
- vitreous, pearly
- Colors
- gray, black, blue, green, yellow
- Streak
- white
- Transparency
- translucent, opaque
Geology
- Origins
- igneous, metamorphic
- Host rocks
- basalt, gabbro, anorthosite
- Associated minerals
- pyroxene, Olivine, Magnetite
- Geography
- Canada (Labrador), Finland, Madagascar, Norway, Russia
Classification
- Rarity
- uncommon
- Gem quality
- Yes
Arcane properties
- Affinity
- arcane, illusion
- Effects
- illusion, mind
- Planar origin
- Material Plane
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