2006-10-15 17:16:43 · 5 answers · asked by Anonymous in Education & Reference ➔ Homework Help
biotite or black mica
2006-10-16 04:23:50 · answer #1 · answered by Jeannie 7 · 1⤊ 0⤋
A worldwide average of the average proportion of the different chemical components in granites, in descending order, is approximately[1]:
* SiO2 — 70.18%
* Al2O3 — 14.47%
* K2O — 4.11%
* Na2O — 3.48%
* CaO — 1.99%
* FeO — 1.78%
* Fe2O3 — 1.57%
* MgO — 0.88%
* H2O — 0.84%
* TiO2 — 0.39%
* P2O5 — 0.19%
* MnO — 0.12%
2006-10-16 00:19:19 · answer #2 · answered by DanE 7 · 0⤊ 2⤋
I believe it is from the mica.
2006-10-16 00:26:13 · answer #3 · answered by kris 2 · 2⤊ 0⤋
its granite.
2006-10-16 00:23:49 · answer #4 · answered by curly 3 · 0⤊ 2⤋
ebonite?
2006-10-16 00:18:16 · answer #5 · answered by sunsic_swa 1 · 0⤊ 1⤋