
1) Copper mineral 2) Orthorhombic mineral
Found on
https://www.crosswordclues.com/clue/antlerite

Antlerite is a greenish hydrous copper sulfate mineral, with the formula Cu3(SO4)(OH)4. It occurs in tabular, acicular, or fibrous crystals with a vitreous luster. Originally believed to be a rare mineral, antlerite was found to be the primary ore of the oxidised zones in several copper mines across the world, including the Chuquicamata mine in Ch...
Found on
http://en.wikipedia.org/wiki/Antlerite

a copper sulfate mineral, Cu3(SO4) (OH)4, that is found in the oxidized zone of copper deposits, particularly in arid regions. At Bisbee, Ariz; ...
Found on
http://www.britannica.com/eb/a-z/a/84

Copper sulphide ore.
Found on
https://copperalliance.org.uk/about-copper/copper-glossary/

Copper sulphide ore.
Found on
https://oldcopper.org/special_topics/glossary.php

an emerald to blackish-green mineral, hydrous copper sulfate, Cu(OH)SO, a major copper ore in Chile.
Found on
https://www.infoplease.com/dictionary/antlerite
No exact match found.