Borate minerals

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

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 too.

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:

Kernite Na₂B₄O₆(OH)₃·3H₂O
Borax Na₂B₄O₅(OH)₄·8H₂O
Ulexite NaCaB₅O₆(OH)₆·5H₂O
Colemanite CaB₃O₄(OH)₃·H₂O
Boracite Mg₃B₇O₁₃Cl

Nickel–Strunz Classification -06- Borates

IMA-CNMNC proposes a new hierarchical scheme (Mills et al., 2009). This list uses it to modify the Classification of Nickel–Strunz (mindat.org, 10 ed, pending publication).

Abbreviations:
- "*" - discredited (IMA/CNMNC status).
- "?" - questionable/doubtful (IMA/CNMNC status).
- "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)
- 03.C Aluminofluorides, 06 Borates, 08 Vanadates (04.H V^[5,6] Vanadates), 09 Silicates:
  - Neso: insular (from Greek νησος nēsos, island)
  - Soro: grouping (from Greek σωροῦ sōros, heap, mound (especially of corn))
  - Cyclo: ring
  - Ino: chain (from Greek ις [genitive: ινος inos], fibre)
  - Phyllo: sheet (from Greek φύλλον phyllon, leaf)
  - Tekto: three-dimensional framework
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 add-on letter

Class: borates

06. Alfredstelznerite
06.A Monoborates
- 06.AA BO₃, without additional anions; 1(D): 05 Sassolite; 15 Nordenskioldine, 15 Tusionite; 35 Jimboite, 35 Kotoite; 40 Takedaite
- 06.AB BO₃, with additional anions; 1(D) + OH, etc.: 05 Hambergite, 10 Berborite, 15 Jeremejevite; 20 Warwickite, 20 Yuanfuliite; 25 Karlite; 30 Azoproite, 30 Bonaccordite, 30 Fredrikssonite, 30 Ludwigite, 30 Vonsenite; 35 Pinakiolite; 40 Blatterite, 40 Orthopinakiolite, 40 Takeuchiite, 40 Chestermanite; 45 Hulsite, 45 Magnesiohulsite, 45 Aluminomagnesiohulsite; 50 Hydroxylborite, 50 Fluoborite; 55 Shabynite, 55 Wightmanite; 60 Gaudefroyite, 65 Sakhaite, 70 Harkerite; 75 IMA2008-060, 75 Pertsevite; 80 Jacquesdietrichite, 85 Painite
- 06.AC B(O,OH)₄, without and with additional anions; 1(T), 1(T)+OH, etc.: 05 Sinhalite, 10 Pseudosinhalite; 15 Behierite, 15 Schiavinatoite; 20 Frolovite, 25 Hexahydroborite, 30 Henmilite, 35 Bandylite, 40 Teepleite, 45 Moydite-(Y), 50 Carboborite, 55 Sulfoborite, 60 Luneburgite, 65 Seamanite, 70 Cahnite
06.H Unclassified Borates
- 06.HA Unclassified borates: 05 Chelkarite, 10 Braitschite-(Ce), 15 Satimolite, 20 Iquiqueite, 25 Wardsmithite, 30 Korzhinskite, 35 Halurgite, 40 Ekaterinite, 45 Vitimite, 50 Canavesite, 55 Qilianshanite

Subclass: nesoborates

06.BA Neso-diborates with double triangles B₂(O,OH)₅; 2(2D); 2(2D) + OH, etc.: 05 Suanite; 10 Clinokurchatovite, 10 Kurchatovite; 15 Sussexite, 15 Szaibelyite; 20 Wiserite
06.BB Neso-diborates with double tetrahedra B₂O(OH)₆; 2(2T): 05 Pinnoite, 10 Pentahydroborite
06.CA Neso-triborates: 10 Ameghinite, 15 Inderite, 20 Kurnakovite, 25 Inderborite, 30 Meyerhofferite, 35 Inyoite, 40 Solongoite, 45 Peprossiite-(Ce), 50 Nifontovite, 55 Olshanskyite
06.DA Neso-tetraborates: 10 Borax, 15 Tincalconite, 20 Hungchaoite; 25 Fedorovskite, 25 Roweite; 30 Hydrochlorborite, 35 Uralborite; 40 Numanoite, 40 Borcarite, 60 Fontarnauite
06.EA Neso-pentaborates: 05 Sborgite; 10 Ramanite-(Rb), 10 Ramanite-(Cs), 10 Santite; 15 Ammonioborite, 25 Ulexite
06.FA Neso-hexaborates: 05 Aksaite, 10 Mcallisterite, 15 Admontite, 20 Rivadavite, 25 Teruggite

Subclass: inoborates

06.BC Ino-diborates with triangles and/or tetrahedra: 10 Calciborite, 10 Aldzhanite*; 15 Vimsite; 20 Sibirskite, 20 Parasibirskite
06.CB Ino-triborates: 10 Colemanite, 15 Hydroboracite, 20 Howlite, 25 Jarandolite
06.DB Ino-tetraborates: 05 Kernite
06.EB Ino-pentaborates: 05 Larderellite, 10 Ezcurrite, 15 Probertite, 20 Tertschite, 25 Priceite
06.FB Ino-hexaborates: 05 Aristarainite, 10 Kaliborite

Subclass: phylloborates

06.CC Phyllo-triborates: 05 Johachidolite
06.EC Phyllo-pentaborates: 05 Biringuccite, 05 Nasinite; 10 Gowerite; 15 Veatchite, 15 Veatchite-A, 15 Veatchite-p; 20 Volkovskite, 25 Tuzlaite, 30 Heidornite, 35 Brianroulstonite
06.FC Phyllo-hexaborates: 05 Nobleite, 05 Tunellite, 05 Balavinskite?; 10 Strontioborite; 15 Ginorite, 15 Strontioginorite; 20 Fabianite
06.GB Phyllo-nonborates, etc.: 05 Studenitsite, 10 Penobsquisite, 15 Preobrazhenskite, 20 Walkerite

Subclass: tektoborates

06.BD Tektodiborates with tetrahedra: 05 Santarosaite
06.DD Tekto-tetraborates: 05 Diomignite
06.ED Tekto-pentaborates: 05 IMA2007-047, 05 Tyretskite, 05 Hilgardite, 05 Kurgantaite
06.GA Tekto-heptaborates: 05 Boracite, 05 Chambersite, 05 Ericaite; 10 Congolite, 10 Trembathite
06.GC Tekto-dodecaborates: 05 Rhodizite, 05 Londonite
06.GD Mega-tektoborates: 05 Ruitenbergite, 05 Pringleite; 10 Metaborite

References

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

Stuart J. Mills; Frédéric Hatert; Ernest H. Nickel & Giovanni Ferraris (2009). "The standardisation of mineral group hierarchies: application to recent nomenclature proposals" (PDF). Eur. J. Mineral. 21: 1073–1080. doi:10.1127/0935-1221/2009/0021-1994.
Ferraiolo, Jim. "Nickel–Strunz (Version 10) Classification System". webmineral.com.
Hr. Dr. Udo Neumann der Uni-Tuebingen (Systematik der Minerale)

External links

Media related to Londonite at Wikimedia Commons

IMA–CNMNC / Nickel–Strunz IDs Mineral categories (classes, subclasses, divisions)
"Special cases" ("native elements and organic minerals")	"Native elements" (IDs 1) Organic minerals (IDs 10)
"Sulfides and oxides"	Sulfides (IDs 2.A–F) Sulfosalts; sulfarsenites, sulfantimonites, sulfbismuthites (IDs 2.G) Sulfosalts; sulfarsenates, sulfantimonates (IDs 2.K) Other sulfosalts (IDs 2.H–J and 2.L–M) Oxides (IDs 4.A–E, e.g. pyrochlore supergroup and corundum group) Hydroxides (IDs 4.F–G) "Arsenites", "sulfites" and iodates (IDs 4.J–K) Tellurium oxysalts Vanadium oxides (IDs 4.H)
"Evaporites and similars"	Carbonates (IDs 5.A–E) Nitrates (IDs 5.N) Borates (IDs 6) Halides (IDs 3)
"Mineral structures with tetrahedral units" (sulfate anion, phosphate anion, silicon, etc.)	Monomeric minerals (similar to nesosilicates) Sulfates (IDs 7.A–E) Thiosulfates (IDs 7.J) Chromates (IDs 7.F) Molybdates, wolframates, niobates (IDs 7.G–H) Phosphates (IDs 8) Arsenates, vanadates (IDs 8) Monomeric, isolated silicates (IDs 9.A) Germanates (IDs 9.J) Silicate frameworks, tectosilicates Zeolite frameworks, zeolite family (IDs 9.G) Other zeolitic frameworks, nepheline and cancrinite-sodalite groups (IDs 9.FB. and 9.FA.05) Other tectosilicates (IDs 9.FA. and 9.FB.15, e.g. feldspars) Other silicate frameworks Cyclosilicates (IDs 9.C) Phyllosilicates (IDs 9.E, e.g. clays) Silica family (IDs 4.DA.) Inosilicates Single chain inosilicates (IDs 9.D, e.g. pyroxenes) Ribbon or multiple chain inosilicates (IDs 9.D, e.g. amphiboles) Other non monomeric minerals Unclassified silicates (IDs 9.H) Sorosilicates (IDs 9.B, e.g. epidote and seidozerite supergroups) Polymeric, isolated silicates (IDs 9.A, e.g. olivine and gadolinite supergroups) Other inorganic polymers (e.g. polyoxometalates; "polyphosphates", IDs 8.F)

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