
1) Cubic mineral 2) Lead mineral
Found on
https://www.crosswordclues.com/clue/altaite

Altaite, or lead telluride, is a yellowish white mineral with an isometric crystal structure. Altaite is in the galena group of minerals as it shares many of properties of galena. Altaite has an unusually high density for a light-colored mineral. Altaite and other rare tellurides are classified in the sulfide mineral class (Dana classification). A...
Found on
http://en.wikipedia.org/wiki/Altaite

Lead telluride
Found on
http://www.translationdirectory.com/glossaries/glossary075.htm
(Lead Telluride) Altaite is a member of the Galena Group of minerals. Its properties are very similar to galena as it shares basically the same structure. However it is easily distinguished from the far more common galena by its white to yellowish white color and greater density. Not too many minerals are greater in density t...
Found on
https://www.encyclo.co.uk/local/23719
No exact match found.