Mineral phase
- IMA name
- Schwertmannite
- Secondary names
- Glockerite
- IMA Code
- Swm
- Class
- non-silicate mineral
- Compound type
- oxide-hydroxide
- Comments
- formula given as Fe3+16O16(OH)12(SO4)2) in Webmineral. Also a sulfate in Strunz classification
- Formula
- Fe3+16O16(OH,SO4)12−13/bullet10−12H2O
- Chemical formula
- Fe16O16(OH,SO4)12-13 • 10-12H2O
- Elemental formula
- (Fe3+)16 (O)32-36 (H)28-34 (O-)14-18 (S)3-4
- Isotope mixture type
- terrestrial abundance
- Composition comments
- from new formula from MinDat
- Oxides
-
Formula Fe2O3 H2O SO3 Mass fraction (%) 82.65 6.99 10.36 - Oxides comments
- determined for the old formula Fe3+16O16(OH)12(SO4)2
Strunz
- Class
- sulfates - chromates - molybdates - tungstates (07)
- Division
- sulfates (selenates, etc.) with additional anions, with H2O (07.D)
- Family
- with only medium-sized cations; unclassified (07.DE)
- Code
- 07.DE.15
Dana
- Major class
- oxides and hydroxides (III)
- Class
- hydroxides and oxides containing hydroxyl (06)
- Type
- containing multiple cations (06.04)
- Group
- -Schwertmannite- group (06.04.10)
- Code
- 06.04.10.01
- Phase type
- crystalline
- Crystal system
- tetragonal
- Crystal class
- dipyramidal
- Crystal class symbol
- 4/m (C4h)
- Crystal spacegroup
- P4/m
- Molar mass
- 1545.76 g/mol
- Density
- 3.77 - 3.99 g/cm3
- State NTP
- solid
- Refringence type
- uniaxial
- Refringence sign
- unknown
- Birefringence
- unknown
- Refraction index no (w)
- 2.13 - 2.17 (calc.)
- Pure color
- yellow
- Color
- browish yellow
- Diaphaneity
- opaque
- Luster
- earthy