It occurs as a secondary mineral in copper deposits in association with olivenite, chalcophyllite, clinoclase, cornwallite, strashimirite, malachite, cuprite and limonite.
en.wikipedia.org Of particular interest to the researchers is the ratio of the current peaks for tenorite and cuprite.
phys.org Secondary copper minerals include chrysocolla, malachite, azurite and cuprite with a supergene zone to 90 metres vertical depth containing chalcocite and lesser covellite.
www.proactiveinvestors.com.au It is found in association with tremolite, quartz, epidote, monazite, copper, cuprite, atacamite, buttgenbachite, malachite, paratacamite, and anthonyite.
en.wikipedia.org It occurs as tufts of very delicate acicular crystals of a fine blue color, and is associated with other copper minerals of secondary origin, such as cuprite and malachite.
en.wikipedia.org