Penggunaan

sunting
Batu delima
Kristal batu delima alami
Umum
KategoriVariasi mineral
Rumus
(unit berulang)
aluminium oksida dengan kromium, Al2O3:Cr
Sistem kristalKelompok Ruang Simbol (-3 2/m) Trigonal (Heksagonal Skalenohedral): R-3c
Identifikasi
WarnaMerah, bisa kecoklatan, keunguan atau kemerahjambuan
PerawakanBervariasi tergantung daerahnya. Prisma heksagonal bertabel buntu.
BelahanTidak ada bersihan asli
FrakturTidak genap atau konkoidal
Kekerasan dalam skala Mohs9.0
KilauKekacaan
Goresputih
Diafaneitastransparan
Massa jenis4'000 Kg/m3
Indeks biasnω=1.768 - 1.772 nε=1.760 - 1.763, Bias ganda 0.008
PleokroismeMerah kejinggaan, merah keunguan
Fluoresensi ultraungumerah di bawah gelombang panjang
Titik lebur2044 °C
Kelarutantidak ada
Variasi utama
SafirSemua warna kecuali merah
Korundumberbagai warna
EmeriGranuler
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