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Mineralpedia Details for Minyulite

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Minyulite

Minyulite

Named for the type locality at the Minyulo Well in Western Australia, Australia. --- and specifically in Australia in a weathered glauconitic, phosphatic ironstone. Other localities for Minyulite include the Shetland Islands near Antarctica, Italy, Belgium, France, and the United States including here in the Black Hills at the Ross Hannibal and Wharf mines in South Dakota. Occurs as white, slender to acicular crystals typically is radial sprays up to 1cm or more across. Crystals are square in cross-section and clear. Found in sedimentary phosphate deposits. 

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/minyulite.pdf

Formula
KAl2(PO4)2F·4H2
Crystal System
Orthorhombic 
Crystal Habit
Acicular to prismatic crystals in radial goups. 
Cleavage
Perfect 
Luster
Silky 
Color
Mostly colorless, can also be green, white, light green 
Streak
white 
Class
Orthorhombic - Pyramidal 
Fracture
Uneven 
Hardness
3.5 
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Mindat
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Minyulite from Ross Hannibal mine, Lawrence Co., South Dakota, United States

Minyulite
            from Ross Hannibal mine, Lawrence Co., South Dakota, United States

White acicular, radial sprays to 3mm with SIncosite.

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Minyulite from Tom's Phosphate quarry, Kapunda, South Australia, Australia

Minyulite
            from Tom's Phosphate quarry, Kapunda, South Australia, Australia

Colorless sprays to 2mm composed of thin prismatic micro crystals with flat terminations.

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Minyulite from Penrice Quarry, Angaston, South Australia, Australia

Minyulite
            from Penrice Quarry, Angaston, South Australia, Australia

Long acicular light pinkish or lilac colored Minulyite crystals to about 1mm filling small 1cm vugs.

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Minyulite from South Rasmussen Ridge mine, Soda Springs, Caribou Co., Idaho, United States

Minyulite
            from South Rasmussen Ridge mine, Soda Springs, Caribou Co., Idaho, United States

Fine white acicular sprays of Minyulite in random lengths to 3mm on black Shale matrix. These crystals were confirmed by XRD and is a new occurence for the mineral and the State of Idaho.

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Minyulite from Moculta Phosphate Quarry, Angaston, Mt Lofty Ranges, South Australia, Australia

Minyulite
            from Moculta Phosphate Quarry, Angaston, Mt Lofty Ranges, South Australia, Australia

Clear to white acicular crystals in radial sprays to 4mm.

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Minyulite from Willard mine, Pershing Co., Nevada, United States

Minyulite
            from Willard mine, Pershing Co., Nevada, United States

White, acicular crystals in radial sprays to 2mm.

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Minyulite from Utahlite claim, Lucin, Box Elder Co., Utah, United States

Minyulite
            from Utahlite claim, Lucin, Box Elder Co., Utah, United States
Special Info
White acicular crystals to 3mm.

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Minyulite from Deep Portland pit, Wharf mine, Lawrence Co., South Dakota, United States

Minyulite
            from Deep Portland pit, Wharf mine, Lawrence Co., South Dakota, United States

Long clear acicular crystals to 1.5cm with rectangular cross-sections.

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