Nifontovite | Gemopedia

Nifontovite is a very rare member of the borate family of minerals. Named for Russian geologist Roman V. Nifontov who discovered it in 1961, nifontovite is found in few locations worldwide, including Russia, Mexico and Japan. Mexico is producing the cleanest and largest specimens at this time. Typically, nifontovite is transparent and typically colorless or gray with a vitreous luster. A nifontivite gem, donated in 2009, resides in the Smithsonian's National Gem Collection.
Colors
Colorless To Gray

Nifontovite Classification

Common Name

Nifontovite

Species

Nifontovite

Variety

Colors

Colorless To Gray

Alternate Names

Gemstone Groups

Key Separations

RI optic character, SG. Might show anomalous interference colors.

Comments

Nifontovite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.575-1.584

Birefringence

0.009

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert to weak violet
LWUV: Inert to weak violet

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: strong fire

Comments

Nifontovite Chemistry & Crystallography

Chemical Name

hydrated calcium borate hydroxide

Chemical Formula

Ca3B6O6(OH)12.2H2O

Synthesis

Crystal System

Monoclinic

Classification

Borate

Nature

Natural

Crystallinity

Crystalline

Comments

Nifontovite Characteristic Physical Properties

Hardness

3.5-5

Streak

Specific Gravity

2.35-2.36

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Uneven

Cleavage

Poor, in one direction

Comments

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