Cleavelandite In Quartz | Gemopedia

This white lamellar variety of albite forms extremely thin, platy crystals that are only fractions of millimeters to a few millimeters thick. Cleavelandite was named in honor of 19th century American professor of geology and mineralogy, Parker Cleaveland.
Colors
Colorless With Inclusions That Are White To Gray, Bluish, Greenish, Reddish

Cleavelandite In Quartz Classification

Common Name

Cleavelandite In Quartz

Species

Quartz

Variety

Colors

Colorless With Inclusions That Are White To Gray, Bluish, Greenish, Reddish

Alternate Names

Gemstone Groups

Key Separations

Refractive index, appearance, birefringence, optic character and optic figure. A bull's-eye optic figure is determinative for quartz; may also show Airy's spiral optic figure and Brazil-law twinning under crossed polarizing filters.

Comments

Cleavelandite In Quartz Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.544-1.553
Tolerance:very constant

Birefringence

0.009

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inclusions: cherry red or blue
LWUV: Inclusions: White

CCF Reaction

Pleochroism

None

Dispersion

Strength: weak fire Value: 0.013

Comments

Cleavelandite In Quartz Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Cleavelandite In Quartz Characteristic Physical Properties

Hardness

7

Streak

White

Specific Gravity

2.64-2.69 Typical:2.66

Toughness

Good

Inclusions

Cleaveandite in quartz will have cleaveandite inclusions and may contain liquid, two-phase and three-phase inclusions, negative crystals, minerals, needles, rutile, iron particles. The cleaveandite inclusions are typically round and white with snowball like appearance.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal

Cleavage

None

Comments

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