What is biotite made of?
Biotite is regarded as a mixture composed of variable proportions of four basic aluminosilicates of potassium, iron, magnesium, or aluminum: annite, K2Fe6(Si6Al2O20)(OH)4; siderophyllite, K2Fe5Al(Si5Al3O20)(OH)4; phlogopite, K2Mg6(Si6Al2O20)(OH)4; and eastonite, K2Mg5A1(Si5Al3O20)(OH)4.
What is biotite used for?
Biotite is used to determine the age of rock through the process of argon-argon dating or potassium-argon dating. Biotite can be used to determine the minimum age of rock and profile its temperature history. Sheet mica is important in the electronics industry as an electrical and thermal insulator.
Is biotite the same as mica?
As noted above, biotite is a name used for a number of black mica minerals that have different chemical compositions but very similar physical properties.
Where can I find biotite?
Location: Biotite is found in many rocks around the world. Noteable deposits are found in Evje, Norway; Bessnes, France; Uluguru mountains in Tanzania; Ontario, Canada; and Laacher See, Germany.
What type of mineral is biotite?
Biotite is the most common mica mineral and also known as black mica, a silicate mineral in the common mica group. Approximate chemical formula K (Mg, Fe). It can be found in massive crystal layers weighing several hundred pounds.
What is the value of biotite?
Petrographic Data File
| Biotite | |
|---|---|
| Property | Value |
| Physical Properties | H = 2.5 – 3 G = 2.7 – 3.3 The color of biotite in hand sample is brown to black (sometimes greenish). Its streak is white or gray, and it has a vitreous luster. |
| Cleavage | (001) perfect |
| Color/Pleochroism | Typically brown, brownish green or reddish brown |
What does biotite break down into?
Biotite breakdown releases Fe and Mg, which diffuse in the melt and lead to growth of either garnet, or cordierite, or tourmaline. Feldspar incongruent dissolution provides the necessary Al, releasing Na, K, Ca and Si into the melt, producing quartz at melt silica saturation.
Is gold found in biotite?
The gold, which occurs as native gold, is associated with biotite breakdown and carbonate alteration reactions.
What color is biotite?
black
The color of biotite in hand sample is brown to black (sometimes greenish). Its streak is white or gray, and it has a vitreous luster.
How much is biotite worth?
Black Mica Biotite at Rs 300/kilogram(s) | Argaghat | Giridih| ID: 9891952630.
Is biotite toxic?
Biotite mica is enriched with essential nutrients (such as Fe, Mg, K, Si, Zn and Mo) which help in body functions. Biotitie also contains toxic trace elements Ni, Cu, Cr, Se, Pb etc. [10, 11]. However, both essental and toxic cations are limitedly available when the mineral is in unaltered form.
What Colour is biotite?
Is biotite a crystal?
Like other micas, biotite has a crystal structure described as TOT-c, meaning that it is composed of parallel TOT layers weakly bonded to each other by cations (c). The TOT layers in turn consist of two tetrahedral sheets (T) strongly bonded to the two faces of a single octahedral sheet (O).