Minyulite
![](/Images/godic/202501/27/Minyulite-1015994813.jpg")
![Minyulite (white) and sincosite (green), from Ross Hannibal Mine, Lead District, South Dakota, US (size: 7.1 x 5.4 x 2.7 cm)](/Images/godic/202501/27/Minyulite-Sincosite-mrz312b4813.jpg")
Minyulite is a rare phosphate mineral with a chemical formula of KAl2(OH,F)(PO4)2·4(H2O).
It occurs as groups of radiating fine fibrous crystals within rock cracks of phosphatic ironstone. Minyulite belongs to the orthorhombic crystal system. This indicates that it has three axes of unequal length yet all are perpendicular to each other. It's cell constants are a=9.35, b=9.74 c=5.52.