Celestine
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
3,0 – 3,5
Specific Gravity
3,9 – 4,0
Refractive Index
1,619 – 1,635
Crystal System
Orthorhombic
Luster
Vitreous
Fracture
Uneven
Color
various
Birefringence
0,004
Pleochroism
Weakly trichroic
Mohs Hardness
Mohs Hardness: 3,0 – 3,5
1 Soft10 Hard
Crystal System
Value & Market
Price Tier
Budget (< $50/ct)
Where to Buy Celestine
Blue Nile
Fine jewelry retailer
James Allen
Gemstone jewelry
Brilliant Earth
Ethically sourced gems
Amazon
Wide selection
Links may earn a commission at no extra cost to you.
Treatments
Celestite, SrSO4, also called celestine, as well as the closely related ,materials anhydrite, CaSO4, also called vulpinite (Webster, p. 298), and barite, BaSO4, are soft sulfates which occur at times with attractive violet or blue colors. Heating to as little as 200�C causes these colors to fade, as also sometimes happens on exposure to light. Irradiation restores or produces the blue or violet color, sometimes in a banded form; the color may be stable to light or may fade, depending on the nature of the material (Przibram and Caffyn, 1956; Pough, 1957). In celestite there are several color centers involved, including SO-3, SO-2 and O-, all stabilized by a potassium impurity (Bernstein, 1979) � Nassau (1984)
3 to 3.5Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
3.90 to 4.00Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
BrittleHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Very brittle
PerfectArthur Thomas, Gemstones (2009)
UnevenArthur Thomas, Gemstones (2009)
Sensitive to heatHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
1.619 to 1.635Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
Biaxial/+Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
0.004 to 0.012Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
Weakly trichroicArthur Thomas, Gemstones (2009)
NilArthur Thomas, Gemstones (2009)
Bluish-white, colourless, seldom reddish, greenWalter Schumann, Gemstones of the world (2001) More from other references
TransparentMichael O?Donoghue, Gems, Sixth Edition (2006) More from other references
VitreousWalter Schumann, Gemstones of the world (2001) More from other references
Inert to weak fluorescence of body color (possible phosphorescence)Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
OrthorhombicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
TabularMichael O?Donoghue, Gems, Sixth Edition (2006) More from other references
Liquid inclusions, partially healed fractures - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 5
Celestine information at mindat.org
Namibia
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 396
About Celestine
La celestina (o celestita) es un sulfato de estroncio que cristaliza en el sistema ortorrómbico, formando cristales tabulares o prismáticos de un delicado color azul cielo pálido —el más característico—, aunque también existe en blanco, incoloro, naranja y verde. Su nombre deriva del latín 'caelestis' (celestial), en referencia a su suave color azulado. Se forma principalmente en depósitos de evaporitas y en venas hidrotermales. Los depósitos de Madagascar producen los cristales azules más hermosos y de mayor tamaño del mundo. Aunque blanda para uso en joyería (dureza 3-3.5), los cristales bien formados son muy apreciados por los coleccionistas.
Jewelry Use
Durability
2/10
Science FYI Family
Frequently Asked Questions
What is Celestine?
La celestina (o celestita) es un sulfato de estroncio que cristaliza en el sistema ortorrómbico, formando cristales tabulares o prismáticos de un delicado color azul cielo pálido —el más característico—, aunque también existe en blanco, incoloro, naranja y verde. Su nombre deriva del latín 'caelesti
What is the hardness of Celestine?
Celestine has a Mohs hardness of 3.0 to 3.5, making it relatively soft for use in jewelry.
What color is Celestine?
Celestine is primarily Various.
How much does Celestine cost?
Celestine falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Celestine?
Celestine belongs to the Orthorhombic crystal system.