Jahnsite with
fairfieldite on predominantly
triphylite matrix.
Origin: Tip Top mine, Custer Co., South Dakota, USA
Sample size about 4 cm, jahnsite crystal 1.5 mm (top right)
jahnsite-(CaMnX) with X = Fe or Mg on
triphylite matrix
Origin: Tip Top mine, Custer Co., South Dakota, USA (type locality
Sample size: top 9 x 8 x 4 cm, middle 3 x 3 x 2 cm, bottom 6.5 x 3 x 3 cm,
crystal 3 mm
Exceptionally large jahnsite-(CaMnMg) crystals to about 4mm. The crystals are
nicely striated, typical of jahnsite. Good coverage with very distinct
crystals on
quartz.
Jahnsite crystals to 2 mm associated with dark, platy
mitridatite on
quartz.
The jahnsite (probably CaMnMg) crystals are large for the species, are
chocolate brown, translucent and striated.
Specimen with unusually large olive green, botryoidal habit
mitridatite to 6 mm associated with a thousands of micro, golden brown
jahnsite
crystals to 1 mm, brownish-grey
leucophosphite micro crystals and
robertsite. Ex. John Barlow collection
Origin: Tip Top mine, Custer Co., South Dakota, United States (type locality)
Ex. Grenier collection
Sample size: 10 x 7 x 3 cm (top), 9 x 6 x 5 cm (2nd row), 10 x 7 x 5 cm
(bottom)
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