Formula: NaAl3(PO4)2(OH)4.2H2O
Origin of name: for Henry Augustus Ward (1834-1906), American collector and founder of Ward's Natural Science Est, Rochester, New York, USA.
Crystal system: Tetragonal
Crystal class: 422
Twinning:
Unit cell: a = 7.056 Å, c = 19.05 Å
Colour: Colourless, white, pale-green, blue-green, yellow-green, pale yellow, brown
Diaphaneity: Transparent to opaque
Luster: Vitreous
Habit: Crystals pyramidal, symmetrically developed, often striated horizontally, crusts, aggregates, granular or fibrous, radial
Hardness: 5
Specific gravity: 2.81-2.87
Cleavage: 1; {001} perfect
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Component of low-temperature phosphatic nodules, an uncommon species in complex zoned pegmatites
| Back to Alphabetical list | Colour photos | Optical properties/Thin sections | SEM images | TEM images | vibrational spectra description | IR spectra | Raman spectra | N-IR spectra | F-IR spectra | IES spectra |