פּירוֹלוּזיט (אנגלית: Pyrolusite) הוא מינרל המורכב בעיקר ממנגן (כ-60% מתכולת המינרל) דו חמצני (MnO₂) והוא בצר חשוב של מנגן. זהו מינרל אמורפי, שחור ורך שמבנהו גרגרי, סיבי או עמודי כשלעתים הוא יוצר צורת כליה. המינרל מלכלך בקלות את הידיים באבקה שחורה.

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Noun
1. a mineral consisting of manganese dioxide; an important source of manganese
(hypernym) mineral
(substance-meronym) manganese, Mn, atomic number 25

(n.)
Manganese dioxide, a mineral of an iron-black or dark steel-gray color and metallic luster, usually soft. Pyrolusite parts with its oxygen at a red heat, and is extensively used in discharging the brown and green tints of glass (whence its name).
  

General Information:
 Chemical Formula:
MnO2
 Composition:
(Molecular Weight = 86.94 gm)
Manganese 63.19 % Mn
Oxygen 36.81 % O 
 Empirical Formula:
Mn4+O2
 Environment:
Sedimentary, hydrothermal, and secondary.
 IMA Status:
Approved IMA 1967
 Locality:
Common world wide.
 Name Origin:
From the Greek, pyro and louein, "fire" and "to wash," because it was used to remove the greenish color imparted to glass by iron compounds.
Physical Properties:
 Cleavage:
[110] Perfect
 Color:
steel gray, iron gray, or bluish gray.
 Density:
4.4 - 5.06, Average = 4.73
 Diaphaniety:
Opaque
 Habits:
Reniform - "Kidney like" in shape (e.g.. hematite)., Dendritic - Branching "tree-like" growths of great complexity (e.g. pyrolusite)., Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
 Hardness:
6-6.5 - Orthoclase-Pyrite
 Luminescence:
None.
 Luster:
Sub Metallic
 Streak:
black
More details...

Eng: pyrolusite
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