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Small, black octehedrons on matrix.

Tiny black octahedrons of this very rare silver mineral.

A lot of black crystals of this extremely rare silver mineral.

A small but excellent specimen with manganoquadratite from the Type Locality. The specimen has a good coverage of small highly lustrous...

Manganoquadratite is a rare silver-manganese-sulfarsenite and was approved in 2011. This specimen from the Type Locality has a good...

You are bidding on an exceptional miniature sample from the Frank Keutsch collection with an exceptionally large crystal of uchucchacuaite...

Well-formed black, metallic crystalgroups of octahedrons.

Very nice sample with more groups of several, shiny black metallic, small crystals with the classic shape, they stay on manganese rich pink...

Very unique crystalaggregates of shiny black crystals in the matrix cavities. This is the best manganoquadratite crystals what I ever seen.

Very good sample with more groups of several, shiny black metallic crystals with the classic shape. Analyzed by Dr. F. Keutsch, author of...

Very rich specimen full of sharp glossy black manganoquadratite crystals. From the type locality - one of only two known localities...

Tiny black octahedrons on matrix.

Grey metallic manganoquadratite from the Uchucchacua Mine, Oyon Province, Lima, Peru. Rare mineral.

Metallic manganoquadratite from the Uchucchacua mine, Lima, Peru. Rare mineral.

Sharp black crystalgroup in the alabandite/calcite matrix cavity.

A lot of black crystals of this extremely rare silver mineral.

Plenty of excellent lustrous metallic crystals of rare manganoquadratite on matrix from the species' type and only locality. Analyzed.

Analyzed, black metallic manganoquadratite from the species' type locality. The white bearer measures 5 x 5 mm for scale.

Nice black, lustrous crystals in alabandite matrix cavity.

Manganoquadratite is a rare silver-manganese-sulfarsenite and was approved in 2011. This specimen from the type locality host a beautiful...

A small but excellent specimen with manganoquadratite from the Type Locality. The specimen has a very good coverage of small highly...

Black, lustrous crystalgroup in alabandite matrix cavity.

Very unique crystalaggregates of shiny black crystals in the matrix cavities.

Grey metallic manganoquadratite from the Uchucchacua, Lima, Peru. Rare mineral.

Plenty of excellent lustrous metallic crystals of rare manganoquadratite on matrix from the species' type and only locality. Analyzed.

A lot of black lustrous crystals on quartz matrix. Very rich specimen.

Unusually colored, tabular red manganoquadratite on matrix from the species' type locality. The bearer measures 6 x 5 mm for scale. EDS-...

A lot of black, metallic octahedrons on matrix. Very rare mineral, hard to obtain.

Plenty of well developed, lustrous metallic crystals of rare manganoquadratite on matrix from the species' type locality. Very rich...

Black metallic manganoquadratite crystals on matrix from the Uchucchacua mine, Peru. Rare mineral.