Vuggy
triphylite matrix filled with acicular, black rockbridgeite crystals to 2
mm associated with
hureaulite crystals to 3 mm. Also associated with
jahnsite.
This specimen has outstanding acicular black rockbridgeite crystals to 0.75 mm
and is associated with light purple glassy
leucophosphite,
vivianite and pink
hureaulite.
Origin: Tip Top mine, Custer Co., South Dakota, USA
Sample size:about 4 cm (top), left 6 x3 x 2 cm, right 10 x 7 x 5 cm (2nd
row), 5 x 3 x 3 cm (3rd row), 7 x 5 x 5 cm (4th/bottom row)
Rockbridgeite with orange crust of
ushkovite
and
eosphorite
Origin: Galileia, Minas Gerais, Brazil
Sample size: 3 x 3 x 2 cm, crystal to 1 cm
Black, lustrous, acicular crystals of rockbridgeite to 0.75 mm as singles and
bundles throughout large vugs lined with light green
leucophosphite,
vivianite and
hureaulite.
Micro brown crystals of
jahnsite-(CaMnMg) to less than 0.2mm covering one side of matrix with
silky, acicular black crystals of rockbridgeite to 1.5cm embedded in matrix.
Origin: Tip Top mine, Custer Co., South Dakota, United States
Ex. Grenier collection
Sample size: 5.5 x 3 x 3 cm (top), 9 x 6 x 4 cm (bottom)
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