Emerald green rounded crystal aggregates of the very rare tellurite mineral xocomecatlite associated to apple green mcalpineite from the famous Bambollita, Moctezuma mine in Mexico. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Mcalpineite
Mcalpineite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Cu₃Te⁶⁺O₆.
It crystallizes in the orthorhombic crystal system (space group Pcca).
Key properties: specific gravity 6.65; Paler green streak; Adamantine luster.
IMA symbol Map, IMA status: approved, named in 1992.
A very rare secondary mineral, produced through alteration of tellurides and tellurium-bearing sulfides.
It is found associated with Quartz, chromian muscovite, choloalite, keystoneite, mimetite, malachite, azurite, annabergite, pyrite, acanthite, hessite, “electrum”, altaite, silver.
The name is derived from the locality at which the mineral originally was found, the McAlpine mine.