Minerals identify

Know how to recognize them

Hidalgoite

Sulfate mineral

Hidalgoite, PbAl3(AsO4)(SO4)(OH)4, is a rare member of the beudantite group and is usually classified as part of the alunite family. It was named after the place where it was first discovered, the Zimapán , Mexico. At Hidalgo where it was initially discovered, it was found as dense white masses in alternating dikes of quartz latite and quartz monzonite alongside other secondary minerals such as sphalerite , cerussite and alamosite, it was then rediscovered at other locations such as Australia above greywacke especially on the anticline prospects of the area, and on fine grained quartz-spessartine, Australia. Hidalgoite specimens are usually associated with copper minerals, clay minerals, iron oxides and polymetallic sulfides in occurrence.

Hidalgoite is categorized under the trigonal crystal system and can be denoted by the H-M symbol (32/m). Physical properties of hidalgoite include its gray white to light gray color, a white streak, specific gravity of 3.96 and a hardness of 4.5. Hidalgoite specimens are usually translucent to sub opaque, and the brittle nature of mineral produces conchoidal fractures. It has an earthy luster.

Identification

Color of mineral

White
Green

Mohs scale ( mineral hardness )

4.5

Density ( specific gravity )

1.713

Luster ( interacts light )

Dull

Crystal ( diaphaneity )

Trigonal