Mineral Information and Data:

Tenorite
CuO [CNMNC approved formula]

Named in 1841 after Michele Tenore (1780-1861), Professor of Botany, University of Naples and G. Tenore, President of the Naples Academy (Italy).

IMA status : Approved Species 1962 ()
CLASSIFICATION 
Dana
(8th edition) :
04.02.03.01  
  (04) Simple Oxides
  (04.02) with a cation charge of 2+ (A++ O)
  (04.02.03)
  
Nickel-Strunz
(10th edition) :
04.AB.10
  (04) Oxides and Hydroxides
  (04.A) Metal:Oxygen = 2.1 and 1:1
  (04.AB) M:O = 1:1 (and up to 1:1.25); with small to medium-sized cations only
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 4.6837(5) Å, b = 3.4226(5) Å, c = 5.1288(6) Å β = 99.47°
Crystal Habit: Crystals lath-like, thin, striated, plates, scales, massive, compact to powdery
Twinning: 1. Common on {011}, producing dovetail reentrants and feather-like forms as senn on {100}; also stellate groups and complex dendritic patterns. 2. On {100} ?
  
Color: Steel-gray to Black
Diaphaneity: Opaque, thin scales translucent
Luster: Metallic
Hardness (Mohs): 3.5
Measured Density: 6.45 g/cm3
Cleavage: Poor/Indistinct In zones [011] and [011]
Tenacity: Brittle; flexible and elastic in thin scales
Fracture: Conchoidal to uneven
Streak: Black
  
Geologic Setting: Commonly in the oxidized zone of hydrothermal copper deposits; a volcanic sublimate.
Mineral Association: Cuprite, copper, chrysocolla, malachite, azurite, Fe–Mn oxides (hydrothermal); copper chlorides, alkali chlorides, cotunnite (volcanic)
  
Synonyms/varieties: Black Copper, Black Oxide of Copper, Melaconisa, Melaconise

 

Tenorite
Tenorite covering copper
Origin: South Lake Mine, Ontonagon Co., Michigan, U.S.A.
Sample size: 6.0 x 4.3 x 2.3 cm
Photo: Rob Lavinsky

 

Tenorite
(zoom-in of above)

 

Tenorite
(zoom-in of above : another side)

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