Spangolite

A secondary mineral commonly occurring with other secondary copper minerals in oxidized zones of copper-bearing ore bodies. Note: The exact type locality is uncertain; the original specimen found “within a radius of 200 miles of Tombstone” (probably from Bisbee). Thin tabular spangolite may be confused with chalcophyllite.

History

Activities related to discovery and approval of the group members

Structural context

Spangolite
Crystal System trigonalCrystal Class ditrigonal pyramidalSpace Group P31c
a8.254—8.2788 (8.2696)
b8.254—8.2788 (8.2696)
c14.354—14.3606 (14.3569)
alpha90
beta90
gamma120
volume846.901—852.389 (850.2767)

Based on 3 measurements

Chemical context

Stoichiometric formulas

Spangolite
mindat.org
  • March 13, 2023Cu6Al(SO4)(OH)12Cl·3H2O
IMA
  • March 13, 2023Cu6Al(SO4)(OH)12Cl · 3H2O
mineralogy.rocks
  • Aug. 30, 2022Cu2+6AlS6+O4(OH)12Cl·3H2O

Elements recorded on EPMA

2
Al
2
Cl
2
Cu
2
H
2
O
2
S

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • dark
  • emerald green
  • blue-green
  • light green
Color noteOriginal color note from the source
Dark to emerald green, blue-green; light green in transmitted light.
StreakStreak entities, recognized using a custom trained NER model
  • pale green
Streak noteOriginal streak note from the source
Pale green
Lustre
Vitreous
Fracture
Conchoidal
Transparency
Transparent
Translucent
Tenacity
brittle
Hardness
3
Measured density
3.135—3.141
Calculated density
3.14