Girolit
| Girolit | |
|---|---|
 Girolit |
|
| Maklumat am | |
| Kategori | Filosilikat |
| Formula kimia | NaCa16(Si23Al)O60(OH)8·14H2O |
| Pengecaman | |
| Warna | Putih, tidak berwarna, hijau, kuning atau perang |
| Tabii hablur | Padat, lamela, berkeping |
| Sistem hablur | Triklinik |
| Pengembaran | Lamela |
| Pembelahan | Sempurna pada {001} |
| Kekerasan skala Mohs | 2 1⁄2 |
| Kilau | Kekaca, bak mutiara |
| Indeks biasan | nα = 1.535 nβ = 1.548 nγ = 1.549 |
| Sifat-sifat optik | Dwipaksi (-) |
| Dwibiasan | δ = 0.0140 |
| Ketumpatan | 2.45 - 2.51 |
| Diafaneiti | Lut sinar, lut cahaya, legap |
Girolit, NaCa16(Si23Al)O60(OH)8·14H2O,[1] ialah mineral silikat nadir (natrium kalsium silikat hydrat asas: N-C-S-H, dalam tatatanda ahli kimia simen) tergolong dalam kelas filosilikat. Girolit juga kerap dikaitkan dengan zeolit. Mineral ini paling biasa dijumpai sebagai bentukan sfera atau jejari pada basalt terubah secara hidroterma dan tuf basalt.[1] Bentukan ini boleh jadi berkaca, pudar atau berserat rupanya.[2]
Girolit juga dikenali sebagai sentralasit, zeolit glimer atau gurolit.[1]
Rujukan
- ^ a b c Ralat petik: Tag
<ref>tidak sah; tiada teks disediakan bagi rujukan yang bernama "Mindat" - ^ "Gyrolite (Hydrated Calcium Silicate Hydroxide)". Galleries.com. Dicapai pada 2016-02-27.
Bacaan lanjut
- Anderson Thomas (1851) Description and analysis of gyrolite, a new mineral species. In: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, Vol. 1, 111–113. (PDF 239,5 kB)
- Fleischer M. (1959) New mineral names. In: American Mineralogist, Vol. 44, 464–470 (PDF 444 kB; p. 7: Centrallasite = Gyrolite).
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