TerraCollect
Terra
Collect
Minerals
Fossils
Rocks
Localities
Blogs
Log in
Login
Registration via App only
You need a Google Account on your mobilephone, to use TerraCollect on the web. Download the app to set up your minerals, fossils, and rocks – the web portal will then be fully accessible to you. :
Download
Are you already register on TerraCollect?
Sign in with Google
By signing in, you accept the
Privacy policy.
Loading data...
Minerals - Goethite | TerraCollect
Mineral - Goethite
Goethite
Fe³⁺O(OH)
Show all 14 images
Links
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
Fe³⁺O(OH)
Unit Cell
a=4.61 b=9.96 c=3.02 Z=4
Physical Properties
Hardness
5 - 5.5
Streak
brown
yellow
yellow brown
Optical Properties
Color
brown
yellow
Birefringence
0.134
Luster
Metallic,
Silky,
Adamantine
Transparency
opaque
Pleochroism
Gelb/Braun
Geomineralogical Properties
Crystal System
orthorhombic
Composition
Elements
Mass
SiO₂
0.36
Fe₂O₃
89.65
H₂O
10.19
Colorado (Palache et al. 1952)
Groups and Members
Diaspore-Group
Map-Layer
Geological Map
Satellite Map
Density
Heavy (3,5-6)
Cleavage
Perfect after {010}
Fracture
uneven
Tenacity
Brittle
Point Group
orthorhombic-dipyramidal - 2/m 2/m 2/m
Space Group
Pnma (62)
Habit
dendritic,
coarse,
bulbous,
crusty,
massive,
acicular,
kidney-shaped,
prismatic,
radial,
stalactitic,
radial,
grape-shaped
Formation
Oxidation zone of iron deposits
Paragenesis
Twinning
Rarity
Very common
Synonyms
Goethite
