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Feldspar
| Feldspar | |
|---|---|
 Sampel hablur feldspar (18×21×8.5 cm) |
|
| Maklumat am | |
| Kategori | Tektosilikat |
| Formula kimia | KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8 |
| Pengecaman | |
| Warna | Merah jambu, putih, kelabu, perang, biru |
| Sistem hablur | Triklin atau monoklin |
| Pembelahan | Dua atau tiga |
| Fraktur | Di satah pembelahan |
| Kekerasan skala Mohs | 6.0–6.5 |
| Kilau | Vitrus |
| Indeks biasan | 1.518–1.526 |
| Dwibiasan | Tahap pertama |
| Pleokroisme | Tiada |
| Guris | Putih |
| Graviti tentu | 2.55–2.76 |
| Ketumpatan | 2.56 |
| Diafaneiti | Legap |
Feldspar ialah sekumpulan mineral tektosilikat dengan formula kimia berulang KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8. Mineral ini membentuk kira-kira 41% daripada batuan di kerak Bumi.[1]
Feldspar boleh ditemui dalam pelbagai batuan enapan.[2]
- ^ Anderson, Robert S.; Anderson, Suzanne P. (2010). Geomorphology: The Mechanics and Chemistry of Landscapes. Cambridge University Press. m/s. 187.
- ^ "Weathering and Sedimentary Rocks." Geology. Diarkibkan 2007-07-03 di Wayback Machine Retrieved on July 18, 2007.
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