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- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.EC.60
- Nickel-Strunz 9th edition (updated 2009)
- 9.EC.60
- IMA Mineral Symbol
- Hbt
- chemical formula
- K(Mg,Fe²⁺)₆((Si,Al)₈O₂₀)(OH)₄ * nH₂O
- Strunz 8th edition (series ID, updated)
- VIII/E.07b
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