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Many sharp crystals of greyish tabular monteregianite-y on matrix.

Very nice crystals of monteregianite-y on pectolite.

Rich specimen of monteregianite-y crystals from MSH.

This specimen shows typical grayish prisms of of the REE mineral monteregianite-y. Purchased from Wilke on 23/05/1983.

You are bidding on a small matrix specimen with very good crystals of monteregianite-Y.

Blade of monteregianite on pectolite.

Greyish elongated tabular crystals of montergianite-y on matrix.

A cluster of white elongated prismatic monteregianite crystals

Nice cluster of monteregianite-y crystals.

Monteregienite y on matrix

You are bidding on a large sample with many vugs hosting small grey prisms of monteregianite-Y with pink blades of calcioancylite and very...

Grey crystal of monteregianite.

This specimen has three relatively large (to 14 mm) radiating sprays of silvery gray monteregianite-(Y). The largest xls reach about 7 mm...

Cluster of monteregianite-y crsytals on the matrix.

MSH is the type, and only known, locality for monteregianite-(Y). This specimen features a rich covering of monteregianite-(Y) with...

Beautiful and well formed grey lathy monteregianite-(Y) crystals on matrix. The crystals show a perfect shape. Specimen from type locality...

Grey monteregianitey crystals on the matrix.

Rich specimen of light grey monteregianite-y crystals on matrix.

Pyrite cubes on tuperssuatsiaite with minor haineautite and monteregianite-y.

Pseudotetragonal elongated crystals of monteregianite-(Y) from the type locality. Rich specimen!

Very nice crystals of yellow thomasclarkite forming a spherical shape. Good size and color for speices.

You are bidding on a small miniature specimen with several vugs hosting rich and quite large prisms of monteregianite-Y crystals with...

Very rare monteregianite in the form of a ball.

Pink monteregianite on matrix. Pink monteregianite is very rare. This is the only pink specimen I have available for sale.

Pink monteregianite-y crystals on matrix. Pink monteregianite is quite rare.

Lustrous tabular greyish crystals of rare monteregianite-Y on matrix from the species' type and only locality, the famed Poudrette Quarry.

Sharp crystals of montereginaite-y crystals with quartz on matrix.

A sample of the rare species monteregianite Y from the Type Locality with several well-formed typical greyish elongated prismatic crystals...

Well formed crystals of monteregianite-y crystals on the matrix.

Classic type locality specimen of monteregianite-(Y) crystals associated with fluorescent calcite, fluorite and sodalite. The Poudrette...