Batu kawi[2] merujuk kepada galian berwarna merah bata berunsur hidrargirum(II) sulfida (HgS) merupakan sumber bijih paling umum untuk mendapatkan raksa.

Batu kawi

Batu kawi
Maklumat am
KategoriMineral sulfida
Formula kimiaHidrargirum(II) sulfida, HgS
Pengecaman
WarnaCochineal-red, towards brownish red and lead-gray
Tabii hablurRhombohedral to tabular; granular to massive and as incrustations
Sistem hablurTrigonal
PengembaranSimple contact twins, twin plane {0001}
PembelahanPrismatic {1010}, perfect
FrakturUneven to subconchoidal
Kekerasan skala Mohs2.0-2.5
KilauAdamantine to dull
Indeks biasannω = 2.905 nε = 3.256
Sifat-sifat optikUniaxial (+)
Dwibiasanδ = 0.351
GurisScarlet
Graviti tentu8.176
Keterlarutan1.04 x 10−25 g per 100 ml water (Ksp at 25 °C = 2 x 10−32)[1]
Diafaneiti Transparan dalam pecahan tipis

Jenis Batu Kawi ditentukan berdasarkan cara terbentuknya iaitu secara:

  • Organik
  • Mekanik
  • Kimia

Ia digunakan sebagai pewarna sejak zaman kuno di Timur Dekat.

Rujukan

sunting
  1. ^ Myers, R.J. (1986). "The new low value for the second dissociation constant of H2S. Its history, its best value, and its impact on teaching sulfide equilibria". J. Chem. Ed. 63: 689, 687–690.
  2. ^ Wilkinson, Richard James (1932). "kawi". A Malay-English dictionary (romanised). I. Mytilini, Yunani: Salavopoulos & Kinderlis. m/s. 519 – melalui TROVE, Perpustakaan Negara Australia.

Bacaan tambahan

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  • Susan Stewart, 2014, "'Gleaming and deadly white': Toxic cosmetics in the Roman world," pp. 84f, 79-88, in History of Toxicology and Environmental Health: Toxicology in Antiquity II (Philip Wexler, Ed.), New York, NY, USA:Academic Press, ISBN 0-12-801634-5
  • Barone G., Di Bella M., Mastelloni M.A., Mazzoleni P., Quartieri S., Raneri S., Sabatino G., Vailati C.,Pottery production of the pittore di lipari: chemical and mineralogical analysis of the pigments, in 2 end European Mineralogical Conference, emc2016 “Minerals, fluids and rocks: alphabet and words of planet earth”, Rimini, 11-15 sett. 2016, p. 716


Templat:Ores