Name/Title
FrankliniteEntry/Object ID
2014.1.48Description
Chemical Composition: Al(OH)3
Crystal System: Hexagonal System
Description: Common Name: Franklinite
Chemistry: (Zn, Fe, Mn)(Fe, Mn)2O4
Group: Oxides and Hydroxides
Location: Franklin, New Jersey
Description: Small specimen with small dark reddish-brown bumps throughout.
Physical Charateristics:
Color is dark black.
• Luster is metallic.
• Transparency: Crystals are opaque.
• Crystal System is isometric; 4/m bar 3 2/m
• Crystal Habits include octahedrons often with dodecahedral faces modifing the edges of the octahedron. The modifing can lead to an overall rounding of the crystal. Also as massive and granular.
• Cleavage is absent.
• Fracture is conchoidal.
• Hardness is 6
• Specific Gravity is 5.0 - 5.2 (slightly above average for metallic minerals)
Streak is reddish brown.
• Other characteristics: Slightly magnetic.
• Associated Minerals include willemite, zincite, calcite, rhodonite and other minerals found at Franklin, New Jersey.
• Notable Occurrences are limited to the world famous mines at Franklin, New Jersey, USA from where franklinite gets its name.
• Best Field Indicators are crystal habit, streak, associations with other zinc minerals and locality.
Hardness: 7 Quartz
Rock Type: SedimentaryCollection
RAGM Mineral CollectionDimensions
Height
2-11/16 inWidth
1-1/2 inLength
2 inLocation
Location
Display Case
FS-11Room
Frieda Smith HallBuilding
Crater Rock MuseumCategory
PermanentMoved By
Ian CunninghamDate
December 27, 2023
