THE
MINERAL PARASYMPLESITE
- Chemistry: Fe3(AsO4)2 - 8H2O, Hydrated Iron Arsenate
- Class: PhosphateClass
- Subclass: Arsenates
- Group: Vivianite
- Uses: Only as mineral specimens.
- Specimens
Parasymplesite is a rare iron arsenate mineral that can make nice micromounted specimens. It can form spherical aggregates of acicular crystals with a green color. It is dimorphous with the mineral symplesite, hence its name. Both minerals have the same exact chemistry, but they have different structures resulting in different symmetries. Parasymplesite is monoclinic while symplesite is triclinic.
Parasymplesite is also in a solid solution series with the mineral kottigite. A solid solution series exists when two or more elements can fill the same position within the structure of two or more minerals. In this case, iron and zinc can occupy the same position in the kottigite/parasymplesite structure. Kottigite is the zinc rich member of the series and parasymplesite is the iron rich member. Parasymplesite and kottigite are isostructural (meaning same structure) with all members of the Vivianite Group of minerals. However, not all of them share elements within their structures.
PHYSICAL CHARACTERISTICS:
- Color is greenish blue, greenish gray or green.
- Luster is vitreous.
- Transparency: Crystals are transparent to translucent.
- Crystal System is monoclinic.
- Crystal Habits include tabular or acicular crystals, radiating fibrous and massive crusts.
- Cleavage is perfect.
- Fracture is uneven.
- Hardness is 2
- Specific Gravity is approximately 3.0 - 3.1 (average for translucent minerals).
- Streak is white.
- Associated Minerals are kottigite, pyrite and symplesite
- Notable Occurrences include Alsace, France and Japan.
- Best Field Indicators are color, crystal habit, cleavage, softness and associations.
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