Herderite | Gemopedia

Herderite is a rare collector gem, typically found in smaller sizes. This mineral occurs in orange, yellow green and blue colors. Herderite was first discovered in Germany in 1828, but Brazil is today's dominant source. Collectors treasure herderite for its often present twinned crystal formation and some specimens exhibit fluorescence.
Colors
Grayish Blue, Yellow, Pink, Violet, Green, Colorless

Herderite Classification

Common Name

Herderite

Species

Herderite

Variety

Colors

Grayish Blue, Yellow, Pink, Violet, Green, Colorless

Alternate Names

Gemstone Groups

Key Separations

Comments

Herderite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.587-1.627

Birefringence

0.023-0.032

Optic Character

Biaxial

Optic Sign

Positive or Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert to moderate yellowish white, blue or violet
LWUV: Inert to weak yellowish white

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: none

Comments

Herderite Chemistry & Crystallography

Chemical Name

Chemical Formula

CaBePO4(F,OH)

Synthesis

Crystal System

Monoclinic

Classification

Phosphate

Nature

Natural

Crystallinity

Crystalline

Comments

Herderite Characteristic Physical Properties

Hardness

5-5.5

Streak

White

Specific Gravity

2.95-3.02

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Poor

Fracture

Subconchoidal

Cleavage

Good, 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