Biotit

Biotit
Agregat tipis datar biotit
(Image width: 2.5 mm)
Umum
KategoriMineral
Rumus kimiaK(Mg,Fe)3(AlSi3O10)(F,OH)2
Identifikasi
Skala Mohs (kekerasan)2.5–3.0
Dispersir < v (kaya Fe);
r > v lemah (kaya Mg)


Biotit adalah mineral filosilikat umum yang ada di dalam grup mika, dengan perkiraan rumus kimia K(Mg,Fe)
3
AlSi
3
O
10
(OH)
2
K(Mg,Fe)3AlSi3O10(OH)2. Lebih umum, mika mengacu pada seri mika gelap, terutama serangkaian larutan-pelarut antara iron-endmember annit, dan magnesium-endmember plogopit; ditambah lagi alumina-endmember siderofilit. Biotit diberi nama oleh J.F.L. Hausmann pada tahun 1847 untuk menghormati fisikawan Prancis Jean-Baptiste Biot, yang, pada tahun 1816, meneliti sifat optik dari mika, dan menemukan banyak sifat - sifat optiknya.[4]

Referensi

  1. ^ a b Handbook of Mineralogy
  2. ^ Biotite mineral information and data Mindat
  3. ^ Biotite Mineral Data Webmineral
  4. ^ Johann Friedrich Ludwig Hausmann (1828). Handbuch der Mineralogie. Vandenhoeck und Ruprecht. hlm. 674.


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