Mineral Information and Data:

Archerite
H2KPO4 [CNMNC approved formula]

Named to honor Dr. Michael Archer (1945- ), Curator of Mammals, Queensland Museum, Brisbane, Australia, who discovered the first specimens.

IMA status : Approved Species 1975 (IMA1975-008)
CLASSIFICATION 
Dana
(8th edition) :
37.01.04.02  
  (37) Anhydrous Acid Phosphates
  (37.01) with miscellaneous formulae
  (37.01.04)
  
Nickel-Strunz
(10th edition) :
08.AD.15
  (08) Phosphates, Arsenates, Vanadates
  (08.A) Phosphates, etc. without additional anions, without H2O
  (08.AD) With only large cations
  
Crystal system: Tetragonal System
Point group (H-M): 42m (or 4 2m) — scalenohedral
Unit cell: a = 7.451 Å, c = 6.792 Å
Crystal Habit: As crystals composed of pyramids and prisms, to 2 mm, and in crusts.
  
Color: White to colorless
Diaphaneity: Translucent
Hardness (Mohs): 1 - 2
Measured Density: 2.23 g/cm3
Streak: White
  
Geologic Setting: As a component of stalactites and crusts on the walls of caves containing bat
guano deposits.
Mineral Association: Biphosphammite, aphthitalite, halite, syngenite, stercorite, oxammite, weddellite, whitlockite, guanine, newberyite, calcite, mundrabillaite
  
Other Properties: H2O Soluble.
Comments: Soluble in H20.

 

Archerite
Buff-colored biphosphammite with white archerite crusts.
Origin: Cockelbiddy Cave, Western Australia, Australia.
Photo: Jeff Weissman

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