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Poldervaartite | Gemopedia
Poldervaartite can be found in a light orange-pink to milky-white color. High-quality poldervaartite specimens are prized by collectors and facetable material is rare.
Colors
Colorless, Milky White, Light Orange-Pink, Pink-White
Poldervaartite Classification
Common Name
Poldervaartite
Species
Poldervaartite
Variety
Colors
Colorless, Milky White, Light Orange-Pink, Pink-White
Alternate Names
Gemstone Groups
Key Separations
RI and birefringence.
Comments
Poldervaartite is only differentiated from olmiite by the percentage of Calcium versus Manganese in the specimen or gemstone.
Poldervaartite Optical Properties
Transparency
Transparent - Translucent
Refractive Index
1.634-1.656
Birefringence
0.022
Optic Character
Biaxial
Optic Sign
Positive
Polariscope Reaction
Doubly Refractive (DR)
Fluorescence
SWUV: Moderate red or pinkish white to pink
LWUV: Weak red or pinkish white to pink
CCF Reaction
Pleochroism
Trichroic, unobservable or weak, varying shades of body color
Dispersion
Strength: weak fire
Comments
Poldervaartite Chemistry & Crystallography
Chemical Name
calcium manganese silicate hydroxide
Chemical Formula
(Ca,Mn2+)2(SiO3OH)(OH)
Synthesis
Crystal System
Orthorhombic
Classification
Silicate
Nature
Natural
Crystallinity
Crystalline to Aggregate
Comments
Poldervaartite Characteristic Physical Properties
Hardness
5
Streak
Specific Gravity
Typical:2.91
Toughness
Poor
Inclusions
Luster
Vitreous
Stability
Fracture
Uneven
Cleavage
None
Comments
