Mineral Information and Data:

Strontianite
SrCO3 [CNMNC approved formula]

Named after the locality: Strontian, Argyllshire, Scotland.

IMA status : Valid species (Pre-IMA 1791) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
14.01.03.03  
  (14) Anhydrous Carbonates
  (14.01) with Simple Formula A+ CO3
  (14.01.03) Aragonite Group (Orthorhombic: Pmcn)
  
Nickel-Strunz
(10th edition) :
05.AB.15
  (05) Carbonates and Nitrates
  (05.A) Carbonates without additional anions, without H2O
  (05.AB) Alkali-earth (and other M2+) carbonates
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Unit cell: a = 5.107 Å, b = 8.414 Å, c = 6.029 Å
Crystal Habit: Crystals short to long prismatic, often spear-shaped or acicular, massive, bladed to fibrous, granular, concretionary
Twinning: Common on {110}, usually contact, also penetration (trillings), lamellar
  
Color: Colorless, white, gray, yellowish, yellowish brown, greenish
Diaphaneity: Transparent, Translucent
Luster: Vitreous to resinous
Hardness (Mohs): 3.5
Measured Density: 3.79 g/cm3
Cleavage: 3; {110} nearly perfect, {021} poor, {010} traces
Tenacity: Brittle
Fracture: Uneven to sub-conchoidal
Streak: White
  
Geologic Setting: An uncommon low-temperature hydrothermal mineral formed in veins in limestone, marl, and chalk; in geodes and concretions; rarely occurs in hydrothermal metallic veins; common in carbonatites.
Mineral Association: Barite, calcite, celestine, harmotome, sulfur
  
Synonyms/varieties: Strontian Spar, Strontian, Stronthianite
Luminescent Properties: May be thermoluminescent; fluorescent under UV, cathodoluminescent under X-rays and electron beams.
Other Properties: Gemstone Unlikely Available.

 

Strontianite
Origin: Austria
Sample size: 3 x 3 x 3 cm
Photo: Tom Loomis

 

Strontianite
(zoom-in of above)

 

Strontianite
Origin: Minerva #1 mine, Hardin Co., Illinois, United States
Sample size: 3.5 x 3 x 1 cm

Photo: Tom Loomis

 

Strontianite
(zoom-in of above)

 

Strontianite
Origin: Winfield Quarry, Winfield, Pennsylvania, United States
Sample size: 3.5 x 3 x 2 cm
Photo: Tom Loomis

 

Strontianite
(zoom-in of above)

 

Strontianite
Origin: Oberdorf an der Laming, Styria, Austria
Sample size: about 2 cm across
Photo and Owner: Milton Speckels

<<< BACK TO MINERAL SEARCH