Mineral Information and Data:

Alamosite
PbSiO3 [CNMNC approved formula]

Named after its discovery locality at Alamos, Mun. de Alamos, Sonora, Mexico.

IMA status : Valid species (Pre-IMA 1909) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
65.07.01.01  
  (65) Inosilicate Single-Width Unbranched Chains, W=1
  (65.07) chains P>7
  (65.07.01)
  
Nickel-Strunz
(10th edition) :
09.DO.20
  (09) Silicates
  (09.D) Inosilicates* Structural terminology per Liebau (1985)
  (09.DO) with 7-, 8-, 10-, 12- and 14-periodic chains
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 12.247 Å, b = 7.059 Å, c = 11.236 Å, b = 113.12°
Crystal Habit: Crystals fibrous, radiating aggregates
  
Color: Colorless to white, cream, or light gray
Diaphaneity: Transparent to translucent
Luster: Adamantine
Measured Density: 6.49 g/cm3
Cleavage: 1; {010} perfect
Streak: White
  
Geologic Setting: As a rare secondary mineral in the oxidized zone of lead-bearing base metal
deposits.
Mineral Association: Wulfenite, leadhillite, cerussite (Alamos, Mexico); leadhillite, anglesite, melanotekite, °eischerite, kegelite, hematite (Tsumeb, Namibia); diaboleite, phosgenite, cerussite, wulfenite, willemite (Tiger, Arizona, USA); melanotekite, shattuckite, wickenburgite (Rawhide mine, Arizona, USA)
  

 

Alamosite
Origin: Tsumeb, Namibia
Sample size: 3.5 x 3 x 2 cm
Photo: John and Mark Schneider

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