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

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