Mineral Information and Data:

Luzonite
Cu3AsS4 [CNMNC approved formula]

Named after the type locality: Mancayan, Luzon Island, Philippines.

IMA status : Valid species (Pre-IMA 1874) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
03.02.02.01  
  (03) Sulfides - Sulfosalts
  (03.02) where z/y = 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.02.02) Luzonite Group
  
Nickel-Strunz
(10th edition) :
02.KA.10
  (02) Sulfides
  (02.K) Sulfarsenates, Sulfantimonates
  (02.KA) Sulfarsenates with (As,Sb)S4 tetrahedra
  
Crystal system: Tetragonal System
Point group (H-M): 42m (or 4 2m) — scalenohedral
Unit cell: a = 5.29Ã…, c = 10.465Ã…
Crystal Habit: Crystals equant, rare, usually rough; massive, fine-grained
Twinning: Common on {112}, also polysynthetic in polished section
  
Color: Deep pinkish-brown
Diaphaneity: Opaque
Luster: Dull, metallic
Hardness (Mohs): 3.5
Measured Density: 4.38 g/cm3
Cleavage: 2; {101} good, {100} distinct
Tenacity: Brittle
Fracture: Uneven to conchoidal
Streak: Black
  
Polymorphism and Series: Dimorphous with enargite. Forms a series with famatinite.
Geologic Setting: In hydrothermal Cu–As–Sb-rich vein and disseminated deposits, formed at low to medium temperatures.
Mineral Association: Enargite, tetrahedrite–tennantite, colusite, stannoidite, pyrite, chalcopyrite, covellite, sphalerite, bismuthinite, silver sulfosalts, silver, gold, marcasite, alunite, barite, quartz
  
Synonyms/varieties: Stibioluzonite (of Stevanović)

 

Luzonite
Origin: Mancayan Mine (Mankayan Mine), Mancayan (Mankayan),
Luzon, Philippines
Sample size: 7.3 x 5.7 x 5.3 cm
Photo: Dan Weinrich

 

Luzonite
(zoom-in of above)

 

Luzonite
Luzonite coating enargite
Origin: Penshan Ore Body, Chinkuahshih Mine, Taiwan, China
Sample size: 8 x 6 x 5 cm
Photo: Rob Lavinsky

 

Luzonite
(zoom-in of above)

<<< BACK TO MINERAL SEARCH