Apatite group |
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Umum |
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Kategori | Phosphate mineral |
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Rumus kimia | Ca5(PO4)3(F,Cl,OH) |
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Klasifikasi Strunz | 08.BN.05 |
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Identifikasi |
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Warna | Transparent to translucent, usually green, less often colorless, yellow, blue to violet, pink, brown.[1] |
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Perawakan | Tabular, prismatic crystals, massive, compact or granular |
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Sistem kristal | Hexagonal dipyramidal (6/m)[2] |
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Belahan | [0001] indistinct, [1010] indistinct[2] |
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Pecahan | Conchoidal to uneven[1] |
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Kekerasan (Skala Mohs) | 5[1] (defining mineral) |
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Kilap | Vitreous[1] to subresinous |
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Gores | White |
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Diafaneitas | Transparent to translucent[2] |
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Berat jenis | 3.16–3.22[2] |
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Kilapan poles | Vitreous[1] |
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Sifat optik | Double refractive, uniaxial negative[1] |
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Indeks bias | 1.634–1.638 (+0.012, −0.006)[1] |
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Bias ganda | 0.002–0.008[1] |
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Pleokroisme | Blue stones – strong, blue and yellow to colorless. Other colors are weak to very weak.[1] |
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Dispersi | 0.013[1] |
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Fluoresens ultraviolet | Yellow stones – purplish-pink, which is stronger in long wave; blue stones – blue to light-blue in both long and short wave; green stones – greenish-yellow, which is stronger in long wave; violet stones – greenish-yellow in long wave, light-purple in short wave.[1] |
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