Brazilianite | Gemopedia

Although this phosphate mineral has a hardness of 5.5, brazilianite is fragile due to its perfect cleavage and brittle nature. Most brazilianite is chartreuse to pale yellow and forms in granitic pegmatites associated with tourmaline and apatite.
Colors
Yellowish Green, Greenish Yellow, Rarely Colorless

Brazilianite Classification

Common Name

Brazilianite

Species

Brazilianite

Variety

Colors

Yellowish Green, Greenish Yellow, Rarely Colorless

Alternate Names

Gemstone Groups

Key Separations

RI, birefringence, optic character

Comments

Brazilianite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.602-1.621
Tolerance:(+0.003/-0.003)

Birefringence

0.019-0.021

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: weak fire Value: 0.014

Comments

Brazilianite Chemistry & Crystallography

Chemical Name

sodium aluminum phosphate hydroxide

Chemical Formula

NaAl3(PO4)2(OH)4

Synthesis

Crystal System

Monoclinic

Classification

Phosphate

Nature

Natural

Crystallinity

Crystalline

Comments

Brazilianite Characteristic Physical Properties

Hardness

5.5

Streak

White

Specific Gravity

3-2.94 Typical:2.97

Toughness

Varies

Inclusions

Brazilianite stones are rarely eye-clean and typically have natural inclusions.

Luster

Vitreous

Stability

Poor

Fracture

Conchoidal

Cleavage

Perfect, in one direction

Comments

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