Mineral Information and Data:

Beryllonite
NaBePO4 [CNMNC approved formula]

Named for one of the major constituents in the composition, BERYLLium.

IMA status : Valid species (Pre-IMA 1888) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
38.01.05.01  
  (38) Anhydrous Phosphates, etc
  (38.01) A+ B++ XO4
  (38.01.05)
  
Nickel-Strunz
(10th edition) :
08.AA.10
  (08) Phosphates, Arsenates, Vanadates
  (08.A) Phosphates, etc. without additional anions, without H2O
  (08.AA) With small cations (some also with larger ones)
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Space group: P21/n
Unit cell: a = 8.178(3) Å, b = 7.818(3) Å, c = 14.114(6) Å, β = 90°, Z=12
Crystal Habit: Tabular on {010} to short prismatic || [010]; crystals may have many forms, especially || [100] and [010]; some faces typically etched to dullness, to 25 cm; also in spherical aggregates, fibrous, massive.
Twinning: On {101}, contact and penetration twins; on {110} and {100} polysynthetic and pseudohexagonal stellate twins.
  
Color: Colorless, white to pale yellow; in transmitted light, colorless
Diaphaneity: Transparent to translucent
Luster: Vitreous to adamantine, may be pearly on {010}
Hardness (Mohs): 5.5 – 6
Measured Density: 2.77 – 2.84 g/cm3
Cleavage: {010}, perfect; {100}, good, interrupted; {101}, indistinct; {001}, in traces.
Tenacity: Brittle
Fracture: Conchoidal
  
Geologic Setting: As a rare secondary mineral in granitic and alkalic pegmatites.
Mineral Association: Herderite, triplite, beryl, apatite, cassiterite, columbite, eosphorite, morinite, vayrynenite, lithiophilite, elbaite, pollucite, petalite, lepidolite, albite, orthoclase, quartz.
  
Other Properties: Gemstone Rare.

 

Beryllonite
Origin: Balachi, Gilgit - Skardu road, Pakistan
Sample size: 3 x 2 x 2 cm
Photo: Tom Loomis

 

Beryllonite
(a different angle of view of above)

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