Kosov u Jihlavy
Tabulka 2. EDX chemické analýzy biotitu z durbachytu; přepočteno na 12 kyslíků.
| 1 | 2 | |
| SiO2 | 37,319 | 38,039 |
| TiO2 | 5,543 | 5,807 |
| Al2O3 | 12,919 | 13,097 |
| Cr2O3 | 0,000 | 0,272 |
| FeO | 13,873 | 13,118 |
| MnO | 0,000 | 0,000 |
| MgO | 14,174 | 14,899 |
| K2O | 9,872 | 9,806 |
| Cl | 2,473 | 1,345 |
| O=Cl | 0,558 | 0,303 |
| H2O | 3,377 | 3,716 |
| suma | 98,992 | 99,795 |
| Si+4 | 2,794 | 2,811 |
| Ti+2 | 0,312 | 0,323 |
| Al+3 | 1,140 | 1,141 |
| Cr+3 | 0,000 | 0,016 |
| Fe+2 | 0,869 | 0,811 |
| Mn+2 | 0,000 | 0,000 |
| Mg+2 | 1,582 | 1,641 |
| K+ | 0,943 | 0,924 |
| Cl | 0,314 | 0,168 |
| H+ | 1,686 | 1,832 |
| siderop.+ eastonite | 0,0% | 0,0% |
| annite | 35,4% | 33,1% |
| phlogopite | 64,6% | 66,9% |