Rich coverage of faint red montgomeryite with minor
robertsite, abundant
whitlockite and
carbonate-apatite
Bright red to light red and pink montgomeryite crystals to 1 mm as lath-like
single crystals and crystal tufts to 2 mm. One side has brilliant black
robertsite crystals on the matrix, which contrast strikingly with the red
montgomeryite.
Origin: Tip Top mine, Custer Co., South Dakota, USA
Sample size: 14 x 7 x 9 cm (top/2nd row), 15 x 6 x 4 cm (bottom)
Brilliant red montgomeryite to 3 mm with a small amount of
englishite
Origin: Tip Top mine, Custer Co., South Dakota, USA
Sample size: 2.5 x 2 cm x 5 mm
Rich coverage of red montgomeryite with
robertsite and
whitlockite
Pink to light red and clear lath-like crystals to 1 mm covering most of matrix
with clear
whitlockite crystals.
Origin: Tip Top mine, Custer Co., South Dakota, USA
Sample size: 7 x 5 x 9.4 cm (top), 5 x 3.5 x 1.5 cm (bottom)
Large
microcline piece with deep red montgomeryite crystals to 3 mm, which is
quite large for the species. Ex. Grenier collection
Pink lath-like crystals of montgomeryite associated with white, platy
messelite micro crystals to 0.5 mm on
quartz
matrix. Ex. Grenier collection
Montgomeryite with
whitlockite
Origin: Tip Top mine, Custer Co., South Dakota, USA
Sample size: about 9 cm (top), 11 x 7.5 x 4 cm (2nd row), 9 x 5 x 4 cm
(3rd row), 8.5 x 6 x 5 cm (bottom)
Bright red long, bladed crystals of montgomeryite in aggregates to 3 mm. The
single crystals are perhaps to 0.75 mm. The red montgomeryite stands out
very nicely against the white
whitlockite/carbonate-apatite
matrix. Associated is shiny black
robertsite.
Origin: Tip Top mine, Custer Co., South Dakota, United States
Ex. Mike Groben Collection
Sample size: 8 x 8 x 4.5 cm
White lath-like crystals to 0.2 mm in vugs associated with black needles of
selenium.
Origin: Redhouse Barite mine, Humboldt Co., Nevada, United States
Sample size: 4 x 4 x 3 cm
Photo courtesy of:
