Clinohumite | Gemopedia

A relatively new addition to the world of gems, clinohumite was first discovered in 1876 within stones erupted from Mount Vesuvius. Only recently have gem-quality pieces been found in locales including Tajikistan's Pamir Mountains. Clinohumite's coloring typically ranges from bright yellow to deep orange to red, but a few brown specimens have been found.
Alternate
Names
Humite
Colors
Bright Yellow, Yellow Brown, Orange, Brownish Orange To Red Brown

Clinohumite Classification

Common Name

Clinohumite

Species

Clinohumite

Variety

Colors

Bright Yellow, Yellow Brown, Orange, Brownish Orange To Red Brown

Alternate Names

Humite

Gemstone Groups

Key Separations

RI and birefringence

Comments

Clinohumite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.629-1.674

Birefringence

0.028-0.041

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: orange-yellow
LWUV: Inert

CCF Reaction

Pleochroism

Trichroic, brownish orange, orangy yellow, and colorless to yellow

Dispersion

Strength: moderate fire Value: 0.021

Comments

Clinohumite Chemistry & Crystallography

Chemical Name

Chemical Formula

(Mg, Fe2+)9(SiO4)4(F,OH))2

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Clinohumite Characteristic Physical Properties

Hardness

6

Streak

White

Specific Gravity

3.13-3.75

Toughness

Poor

Inclusions

Clinohumite might have fingerprints, euhedral crystals and color zoning.

Luster

Vitreous

Stability

Fracture

Subconchoidal

Cleavage

Poor, in one direction

Comments

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