Borate mineral

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The borate minerals are minerals which contain a borate anion group. The borate (BO3) units may be polymerised similar to the SiO4 unit of the silicate mineral class. This results in B2O5, B3O6, B2O4 anions as well as more complex structures which include hydroxide or halogen anions.[2] The [B(O,OH)4] anion exists as well.

Large (up to 1.8 cm) yellow londonite crystals associated with rubellite tourmaline. Londonite is an unusual caesium-rich heptaborate.[1]

Many borate minerals, such as borax, colemanite, and ulexite, are salts: soft, readily soluble, and found in evaporite contexts. However, some, such as boracite, are hard and resistant to weathering, more similar to the silicates.

There are over 100 different borate minerals.[2][3] Borate minerals include:

Nickel–Strunz Classification -06- BoratesEdit

IMA-CNMNC proposes a new hierarchical scheme (Mills et al., 2009). This list uses it to modify the Classification of Nickel–Strunz (, 10 ed, pending publication). Note that although Nickel–Strunz division letters were traditionally based on the number of boron atoms in a mineral's chemical formula (06.A are monoborates, 06.B are diborates, etc.), the IMA has reclassified borate minerals based on the polymerisation of the borate anion.

  • REE: rare-earth element (Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu)
  • PGE: platinum-group element (Ru, Rh, Pd, Os, Ir, Pt)
  • * : discredited (IMA/CNMNC status)
  • ? : questionable/doubtful (IMA/CNMNC status)

Regarding 03.C Aluminofluorides, 06 Borates, 08 Vanadates (04.H V[5,6] Vanadates), 09 Silicates:

  • neso-: insular (from Greek νῆσος nêsos, "island")
  • soro-: grouped (from Greek σωρός sōrós, "heap, pile, mound")
  • cyclo-: rings of (from Greek κύκλος kúklos, "circle")
  • ino-: chained (from Greek ίνα ína, "fibre", [from Ancient Greek ἴς])
  • phyllo-: sheets of (from Greek φῠ́λλον phúllon, "leaf")
  • tekto-: three-dimensional framework (from Greek τεκτονικός tektōnikós, "of building")
Nickel–Strunz code scheme: NN.XY.##x
  • NN: Nickel–Strunz mineral class number
  • X: Nickel–Strunz mineral division letter
  • Y: Nickel–Strunz mineral family letter
  • ##x: Nickel–Strunz mineral/group number; x an add-on letter

Class: boratesEdit

Subclass: nesoboratesEdit

Subclass: inoboratesEdit

Subclass: phylloboratesEdit

Subclass: tektoboratesEdit

See alsoEdit


  1. ^ Londonite at
  2. ^ a b Klein, Cornelis and Cornelius Hurlbut, Jr., Manual of Mineralogy, Wiley, 20th ed., 1985 pp. 343 - 347 ISBN 0-471-80580-7
  3. ^ Webmineral.Com, Strunz group V/G - V/L

External linksEdit