פְלוֹגוֹפִיט, הידוע גם בכינוי "נציץ מגנזיום", הוא מינרל סיליקטי שגונו חום־אדמדם או חום־ירקרק. הפְלוֹגוֹפִיט שייך לקבוצת הנציצים, מינרלים ממשפחת המינרלים הפילוסיליקטיים, שהם סיליקטים שמבנם דמוי לוחיות.

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Noun
1. a brown form of mica consisting of hydrous silicate of potassium and magnesium and aluminum
(hypernym) mica, isinglass

(n.)
A kind of mica having generally a peculiar bronze-red or copperlike color and a pearly luster. It is a silicate of aluminia, with magnesia, potash, and some fluorine. It is characteristic of crystalline limestone or dolomite and serpentine. See Mica.
  

General Information:
 Chemical Formula:
KMg3(Si3Al)O10(F,OH)2
 Composition:
(Molecular Weight = 417.26 gm)
Potassium 9.37 % K 
Magnesium 17.47 % Mg
Aluminum 6.47 % Al
Silicon 20.19 % Si
Hydrogen 0.48 % H 
Oxygen 46.01 % O 
 Empirical Formula:
KMg3AlSi3O10(OH)2
 Environment:
Contact and regional metamorhic limestones and dolomites.
 Locality:
St. Lawrence Co., at Edwards, New York, USA.
 Name Origin:
From the Greek flogopos - "resembling fire."
Physical Properties:
 Cleavage:
[001] Perfect
 Color:
brown, gray, green, yellow, or reddish brown.
 Density:
2.7 - 2.9, Average = 2.8
 Diaphaniety:
Transparent to translucent
 Habits:
Micaceous - Platy texture with "flexible" plates., Scaly - Morphology like fish scales., Lamellar - Thin laminae producing a lamellar structure.
 Hardness:
2-2.5 - Gypsum-Finger Nail
 Luminescence:
None.
 Luster:
Vitreous - Pearly
 Streak:
white
More details...

B: (Kimia) flogopit

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