Name/Title
AegirineEntry/Object ID
2014.1.2Description
Chemical Composition: SiO2
Crystal System: Hexagonal System
Description: Common Name:Aegirine
Chemistry: NaFe3+Si2O6
Group: Pyroxene
Location: Africa
Description: Small black (dark green) crystals pertruding from a crystalline feldspar matrix.
Phyisical Charateristics:
Physical Properties of Aegirine
Lustre:
Vitreous
Diaphaneity (Transparency):
Transparent, Opaque
Comment:
Slightly resinous
Colour:
Dark green to greenish black, reddish brown, black
Comment:
bright green to yellow-green in thin section
Streak:
Pale yellowish grey
Hardness (Mohs):
6
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on {110}
Parting:
on {100}
Fracture:
Irregular/Uneven
Density (measured):
3.5 - 3.6 g/cm3
Density (calculated):
3.576 g/cm3
Physical Charateristics:
Physical Properties of Mascagnite
Lustre:
Vitreous, Dull
Diaphaneity (Transparency):
Transparent, Translucent, Opaque
Colour:
Colourless, grey, yellowish-grey, yellow; colourless in transmitted light
Hardness (Mohs):
2 - 2½
Tenacity:
Sectile
Cleavage:
Distinct/Good
On {001}.
Parting:
Twin gliding with K1(110), K2(130).
Fracture:
Irregular/Uneven
Density (measured):
1.768 g/cm3
Density (calculated):
1.769 g/cm3
Hardness: 7 Quartz
Rock Type: SedimentaryCollection
RAGM Mineral CollectionAcquisition
Accession
2014.1Source or Donor
Crater Rock Museum (unknown donors)Acquisition Method
GiftDimensions
Height
3-1/2 inWidth
1-3/4 inLength
2-1/4 in
