MicaCalc automatically calculates muscovite compositions from microprobe analyses.
The results are presented in tables and in various diagrams (Phengite solid solution series, Mu-Pg-Ce diagram, A'KF diagram, AFM (Ms and Kf) diagram. For further details see below.
Using microprobe analyses, this program can be used to automatically calculate muscovite compositions based on 22 oxygen atoms. The oxides, the cations, the lattice site occupancies, the end members Margarite (CaAl₂)[Si₂Al₂O₁₀](OH)₂), Paragonite (NaAl₂)[Si₃AlO₁₀](OH)₂), Celadonite (K(Mg, Fe²⁺)(Fe³⁺, Al)[Si₄O₁₀](OH)₂) and Muscovite (KAl₂[AlSi₃O₁₀](OH)₂), as well as the values for divalent and trivalent iron are calculated (total iron, Fe²⁺, Fe³⁺).
The micas are classified using the Muscovite-phengite-celadonite diagram, the A'KF diagram (A' = [Al₂O₃+Fe₂0₃]-[Na₂O+K₂O+CaO], K = K₂O, F = Fe0+MgO+MnO) and the AFM (Ms and Kf) diagrams.
Furthermore, the micas are presented in a diagram in which the Si content per formula unit (Si/f.u.) is plotted against the aluminum content per formula unit (Al/f.u.) (based on 11 oxygen atoms). The straight line shown in this diagram represents the Phengite solid solution series. The Si content of muscovite can provide information about the physical conditions during metamorphism (“Phengit Barometer”;
see literature).
You can enter the values individually in the table below or use the input fields. Here you enter for up to 5 micas the values (oxides) as rows separated by single spaces (see placeholders; 200 characters max.). Note the order of the elements in the table: Na Mg Al Si K Ca Ti Mn Fe (total Fe as FeO) H₂O Ba Cr! Additionally, the sample designation must come first. You can use the period or the comma as a decimal separator.
You can also enter your data (oxides) here (into the light-blue fields).
Name | |||||
Oxides | Oxides | Oxides | Oxides | Oxides | |
Na2O | |||||
MgO | |||||
Al2O3 | |||||
SiO2 | |||||
K2O | |||||
CaO | |||||
TiO2 | |||||
MnO | |||||
FeO | |||||
H2O | |||||
BaO | |||||
Cr2O3 | |||||
Total | |||||
Temperature selection* | |||||
Temp. [°C] |
Oxides [wt.-%] | Mol wt. (AW) | Mol-Prop. | Element | Wt.-% | Atom-Prop. | Oxygen | Cations (O=22) | |
---|---|---|---|---|---|---|---|---|
Mica 1 | ||||||||
SiO2 | Si | |||||||
TiO2 | Ti | |||||||
Al2O3 | Al | |||||||
Cr2O3 | Cr | |||||||
MgO | Mg | |||||||
CaO | Ca | |||||||
MnO | Mn | |||||||
FeO | Fe | |||||||
BaO | Ba | |||||||
Na2O | Na | |||||||
K2O | K | |||||||
Total* | *without Water | |||||||
Mica 2 | ||||||||
SiO2 | Si | |||||||
TiO2 | Ti | |||||||
Al2O3 | Al | |||||||
Cr2O3 | Cr | |||||||
MgO | Mg | |||||||
CaO | Ca | |||||||
MnO | Mn | |||||||
FeO | Fe | |||||||
BaO | Ba | |||||||
Na2O | Na | |||||||
K2O | K | |||||||
Total* | *without Water | |||||||
Mica 3 | ||||||||
SiO2 | Si | |||||||
TiO2 | Ti | |||||||
Al2O3 | Al | |||||||
Cr2O3 | Cr | |||||||
MgO | Mg | |||||||
CaO | Ca | |||||||
MnO | Mn | |||||||
FeO | Fe | |||||||
BaO | Ba | |||||||
Na2O | Na | |||||||
K2O | K | |||||||
Total* | *without Water | |||||||
Mica 4 | ||||||||
SiO2 | Si | |||||||
TiO2 | Ti | |||||||
Al2O3 | Al | |||||||
Cr2O3 | Cr | |||||||
MgO | Mg | |||||||
CaO | Ca | |||||||
MnO | Mn | |||||||
FeO | Fe | |||||||
BaO | Ba | |||||||
Na2O | Na | |||||||
K2O | K | |||||||
Total* | *without Water | |||||||
Mica 5 | ||||||||
SiO2 | Si | |||||||
TiO2 | Ti | |||||||
Al2O3 | Al | |||||||
Cr2O3 | Cr | |||||||
MgO | Mg | |||||||
CaO | Ca | |||||||
MnO | Mn | |||||||
FeO | Fe | |||||||
BaO | Ba | |||||||
Na2O | Na | |||||||
K2O | K | |||||||
Total* | *without Water |
Mica 1 | Mica 2 | Mica 3 | Mica 4 | Mica 5 | |
---|---|---|---|---|---|
Grid occupation | |||||
Tetrahedron | |||||
Tetrahedral Al | |||||
Octahedral Al | |||||
Octahedron | |||||
Interlayer | |||||
Total | |||||
Check total
Compares the sum of the cations (O=22) with the sum of the lattice occupation. These should be equal, so the difference should be 0. Minor deviations can be attributed to rounding errors. Otherwise there may be an analysis error.
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The ratio FeO/(FeO+MgO) | |||||
FeO/(FeO+MgO) | |||||
A´KF | |||||
A´ | |||||
K | |||||
F | |||||
Total | |||||
A´KF (*100) | |||||
A´ | |||||
K | |||||
F | |||||
Total | |||||
AFM (Ms) | |||||
A (Ms) | |||||
F | |||||
M | |||||
AFM (Kf) | |||||
A (Kf) | |||||
F | |||||
M |
Mica 1 | Mica 2 | Mica 3 | Mica 4 | Mica 5 | |
---|---|---|---|---|---|
SiO2 | |||||
TiO2 | |||||
Al2O3 | |||||
Cr2O3 | |||||
MgO | |||||
CaO | |||||
MnO | |||||
FeO | |||||
BaO | |||||
Na2O | |||||
K2O | |||||
H2O | |||||
Total | |||||
Cations | |||||
Si | |||||
Ti | |||||
Al | |||||
Cr | |||||
Mg | |||||
Ca | |||||
Mn | |||||
Fe | |||||
Ba | |||||
Na | |||||
K | |||||
Total | |||||
The ratio FeO/(FeO+MgO): X(Fe) | |||||
X(Fe) | |||||
Grid occupation | |||||
Si | |||||
AlIV | |||||
Tetrahedron | |||||
AlVI | |||||
Cr | |||||
Ti | |||||
Fetotal (Fe²⁺) | |||||
Mn | |||||
Mg | |||||
Octahedron | |||||
Ba | |||||
Ca | |||||
Na | |||||
K | |||||
Interlayer | |||||
Total | |||||
End-members | |||||
Margarite
Margarite: (CaAl₂)[Si₂Al₂O₁₀](OH)₂)
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Paragonite
Paragonite: (NaAl₂)[Si₃AlO₁₀](OH)₂)
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Celadonite
Celadonite: (K(Mg, Fe²⁺)(Fe³⁺, Al)[Si₄O₁₀](OH)₂)
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Muscovite
Muscovite (KAl₂[AlSi₃O₁₀](OH)₂)
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Total | |||||
Phengite component in Muscovite
The term phengite is generally used for muscovites whose Si/Al ratio is greater than 3:1 and in which the increase in Si is associated with a substitution of Mg²⁺ and Fe²⁺ for Al on the octahedrally coordinated lattice sites (Deer et al., 1992).
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Phengite | |||||
Muscovite | |||||
Total | |||||
The Phengite-Celadonite-Muscovite diagram | |||||
Paragonite (Pa) | |||||
Celadonite (Ce) | |||||
Muscovite (Mu) | |||||
Total | |||||
Fetot., Fe²⁺, Fe³⁺ | |||||
Fetot. | |||||
Fe²⁺ | |||||
Fe³⁺ | |||||
The A'KF diagram | |||||
A' | |||||
K | |||||
F | |||||
Total | |||||
The AFM(Ms) diagram | |||||
A (Ms) | |||||
F | |||||
M | |||||
The AFM(Kf) diagram | |||||
A (Kf) | |||||
F | |||||
M | |||||
Total | |||||
"Phengite barometer" | |||||
Al/f.u. (11 O) | |||||
Si/f.u. (11 O) | |||||
Additional values [pfu] | |||||
K+Na+Ca (22 O) | |||||
Ti (11 O) | |||||
Fe+Mg (22 O) | |||||
Na/(Na+K) (22 O) | |||||
Na/(Na+K) (11 O) | |||||
Mean values (Mica 1–5) | |||||
Ø Al (11 O) | |||||
Ø Si (11 O) | |||||
Min. Si (11 O) | |||||
Max. Si (11 O) | |||||
Ø Ti (22 O) | |||||
Ø Si (22 O) | |||||
Min. Ti (22 O) | |||||
Max. Ti (22 O) |
Captions
• |
Mica 1 |
• |
Mica 2 |
• |
Mica 3 |
• |
Mica 4 |
• |
Mica 5 |
Top corner |
Paragonite |
Right corner |
Celadonite |
Left corner |
Muscovite |
Captions
• |
Mica 1 |
• |
Mica 2 |
• |
Mica 3 |
• |
Mica 4 |
• |
Mica 5 |
Captions
• |
Mica 1 |
• |
Mica 2 |
• |
Mica 3 |
• |
Mica 4 |
• |
Mica 5 |
Bottom corner |
F = Fe0+MgO+MnO |
Red dot bottom corner |
Antophyllite, Opx |
Dark green field |
Chlorite |
White dot in dark green field |
Almandine |
Top right corner |
K = K₂O |
Purple dot top right corner |
K-feldspar |
Red dot at end of phengite line |
Muscovite |
Top left corner |
A' = (Al₂O₃+Fe₂0₃)-(Na₂O+K₂O+CaO) |
Green dot top left corner |
Kyanite, Andalusite, Sillimanite |
Captions
• |
Mica 1 |
• |
Mica 2 |
• |
Mica 3 |
• |
Mica 4 |
• |
Mica 5 |
The AFM(Ms) diagram |
Captions
• |
Mica 1 |
• |
Mica 2 |
• |
Mica 3 |
• |
Mica 4 |
• |
Mica 5 |
The AFM(Kf) diagram |
Current date
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