Prosopite | Gemopedia

The mineral prosopite is named from the Greek word prosopon, meaning mask, most likely a reference to its pseudomorphic forms. It typically ranges in color from white to gray to colorless. There is a beautiful blue Mexican variety that resembles softly colored turquoise that is of particular interest to collectors.
Colors
Robin's Egg Blue, Colorless To Grayish White

Prosopite Classification

Common Name

Prosopite

Species

Prosopite

Variety

Colors

Robin's Egg Blue, Colorless To Grayish White

Alternate Names

Gemstone Groups

Key Separations

RI, SG and possibly specrtum

Comments

Prosopite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.501-1.51

Birefringence

0.009

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: none

Comments

Prosopite Chemistry & Crystallography

Chemical Name

calcium aluminum flouride hydroxide

Chemical Formula

CaAl2(F,OH)8

Synthesis

Crystal System

Monoclinic

Classification

Halide

Nature

Natural

Crystallinity

Aggregate

Comments

Prosopite Characteristic Physical Properties

Hardness

4.5

Streak

Specific Gravity

2.69-2.9 Typical:2.88

Toughness

Fair

Inclusions

Luster

Vitreous

Stability

Fracture

Conchoidal, Uneven

Cleavage

Perfect, in one direction

Comments

JTV on Google+
0 Items
My Wish List
Close
Item
Description
Qty.
Price


Estimated Order Total:
0
Total Due Today:
0
Close
Item
Description
Qty.
Price


Page of 1