| |
2 align=centerTourmaline
|
| |
center
|
| |
2
|
| |
center bgcolor="#9966FF"
|
| |
2General
|
| |
"http://wwwinformationdelightinfo/encyclopedia/entry/Mineral" class="copylinks">Mineral Group
|
| |
"http://wwwinformationdelightinfo/encyclopedia/entry/Chemical_formula" class="copylinks">Chemical Formula Na(Al,Fe,Li,Mg,Mn)M<sub>3</sub>Al(Si<sub>6</sub>O<sub>18</sub>)(BO<sub>3</sub>)<sub>3</sub>(OH,F)<sub>4</sub>
|
| |
"center" bgcolor="#9966FF"
|
| |
2Identification
|
| |
"http://wwwinformationdelightinfo/encyclopedia/entry/Crystal_habit" class="copylinks">Crystal Habit Parallel and elongated Acircular prisms, sometimes radiating Massive Scattered grains (in granite)
|
| |
"http://wwwinformationdelightinfo/encyclopedia/entry/Crystal_structure" class="copylinks">Crystal System Trigonal
|
| |
"http://wwwinformationdelightinfo/encyclopedia/entry/Cleavage_(crystal)" class="copylinks">Cleavage Good to poor prismatic Poor rhombohedral
|
| |
"http://wwwinformationdelightinfo/encyclopedia/entry/Fracture" class="copylinks">Fracture Subconchoidal to even
|
| |
"http://wwwinformationdelightinfo/encyclopedia/entry/Mohs_Scale" class="copylinks">Mohs Scale hardness 7 - 75
|
| |
"http://wwwinformationdelightinfo/encyclopedia/entry/Refractive_index" class="copylinks">Refractive Index nω=1635 - 1675 nε=1610 - 1650
|
| |
"http://wwwinformationdelightinfo/encyclopedia/entry/Pleochroism" class="copylinks">Pleochroism None
|
| |
"http://wwwinformationdelightinfo/encyclopedia/entry/Streak" class="copylinks">Streak Colorless
|
| |
"http://wwwinformationdelightinfo/encyclopedia/entry/Specific_gravity" class="copylinks">Specific Gravity 302 - 326
|
| |
"center" bgcolor="#9966FF"
|
| |
2The 14 recognized minerals in the group (endmember formulas)
|
| |
"http://wwwinformationdelightinfo/encyclopedia/entry/Elbaite" class="copylinks">Elbaite Na(Li<sub>15</sub>,Al<sub>15</sub>)Al<sub>6</sub>Si<sub>6</sub>O<sub>18</sub>(BO<sub>3</sub>)<sub>3</sub>(OH)<sub>4</sub>
|
| |
"http://wwwinformationdelightinfo/encyclopedia/entry/Schorl" class="copylinks">Schorl NaFe<sup>2+</sup><sub>3</sub>Al<sub>6</sub>Si<sub>6</sub>O<sub>18</sub>(BO<sub>3</sub>)<sub>3</sub>(OH)<sub>4</sub>
|
| |
"http://wwwinformationdelightinfo/encyclopedia/entry/Dravite" class="copylinks">Dravite NaMg<sub>3</sub>Al<sub>6</sub>Si<sub>6</sub>O<sub>18</sub>(BO<sub>3</sub>)<sub>3</sub>(OH)<sub>4</sub>
|
