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Creedite Pictures

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Creedite from Santa Eulalia, Chihuahua, Mexico.  Specimen measures 3" across;  close-up on right.

CHEMISTRY - Ca₃Al₂F₄(OH,F)₆(SO₄)^.2H₂O

CRYSTALLOGRAPHY - Monoclinic

CRYSTAL GROWTH AND HABITS - Crystals are commonly short prismatic or acicular.  It also forms radiating aggregates of prismatic crystals and radiating fibrous masses like Wavellite.

COLOR AND OPTICAL PROPERTIES - Colorless to white, yellowish white, rarely purple.  Transparent.

HARDNESS - 4

SPECIFIC GRAVITY - 2.7

LUSTER - Vitreous

STREAK - White

BREAKABILITY - Very good cleavage {100}, fracture is conchoidal;  Brittle.

OCCURRENCE - Found with barite in Kaolinite in the upper portions of a fluorite-barite vein near Wagon Wheel Gap, Colorado.

ASSOCIATED MINERALS - Kaolinite, Barite.

MINERAL NAME - Named after it discovery location of Creede, Colorado.