elundeid
Elundeid is a rare mineral species described in the mid-20th century. It is categorized as a metallic sulfide with a variable composition and a distinctive monoclinic crystal habit. The color ranges from pale olive-gray to steel-gray, and it has a metallic to submetallic luster. Hardness on the Mohs scale is about 5 to 6.
The name elundeid derives from the Elunda region where the mineral was first identified. The suffix -eid
Elundeid occurs in hydrothermally altered metamorphic rocks and skarns, often in districts with abundant manganese and
The chemistry is variable, with copper, iron, and sulfur forming core constituents and small amounts of arsenic,
Because elundeid lacks a fixed stoichiometry in many samples, some mineralogists consider it a distinct species,
Elundeid is of interest mainly to mineralogists and collectors due to its rarity and unusual structure. Its