Mineral Information and Data:

Cerussite
PbCO3 [CNMNC approved formula]

Named from the Latin, cerussa, meaning "white lead.".

IMA status : Valid species (Pre-IMA 400BC) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
14.01.03.04  
  (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 = 5.183 Ǻ, b = 8.503 Ǻ, c = 6.144 Ǻ
Crystal Habit: Crystals tabular, elongated along a-axis, or equant, acicular or thin tabular; twinned; granular, massive, jackstraw
Twinning: Common on {110}, lamellar, reticulated, cyclic (sixlings); less common on {130}, contact, heart-shaped
  
Color: Colorless, white, gray, smoky, blue, green, black
Diaphaneity: Transparent, Translucent
Luster: Adamantine, tending towards vitreous, resinous
Hardness (Mohs): 3 to 3.5
Measured Density: 6.55 g/cm3
Cleavage: 4; {110} and {021} distinct, {010} and {012} trace
Tenacity: Very brittle
Fracture: Conchoidal
Streak: White
  
Geologic Setting: Common in the oxidized zone of lead deposits, where it may constitute an
important ore.
Mineral Association: Anglesite, smithsonite, malachite, azurite, phosgenite, pyromorphite, galena
  
Synonyms/varieties: Acrusite, Black Lead Ore, Lead Spar, White Lead Ore, Carbonate of Lead
Luminescent Properties: May fluoresce yellow under LW UV.
Other Properties: Gemstone Rare.

 

Cerussite
Origin: Tsumeb, Namibia
Sample size: 4 x 3 x 2 cm, bladed crystals 1.5 cm
Photo: Tom Loomis

 

Cerussite
(zoom-in of above)

 

Cerussite
Origin: Broken Hill, NSW, Australia
Sample size: 4 x 4 x 2 cm
Photo: Tom Loomis

 

Cerussite
"Jackstraw" habit, acicular
Origin: Flux mine, Pima Co., Arizona, USA
Sample size: crystals to 1.5 cm
Photo: Tom Loomis

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