glauconite
Sign in to saveAlso known as green sand, glauconite mica series
Glauconite is an iron potassium phyllosilicate (mica group) mineral of characteristic green color which is very friable and has very low weathering resistance.
Key facts
- Mineral.name
- Glauconite
- Mineral.category
- Phyllosilicate minerals
- Mineral.group
- Mica group, dioctahedral mica group
- Mineral.image
- File:Glauconite from the Dutch Pliocene.jpg
- Mineral.imagesize
- 280
- Mineral.caption
- Glauconite pellets and small fossils among quartz grains in greensand from the Dutch Pliocene
- Mineral.IMAsymbol
- Glt
- Mineral.system
- Monoclinic
- Mineral.class
- Prismatic (2/m) (same H-M symbol)
- Mineral.symmetry
- C2/m
- Mineral.unit cell
- a = 5.234 Å, b = 9.066 Å, c = 10.16 Å; β = 100.5°; Z = 2
- Mineral.color
- Blue green, green, yellow green
- Mineral.habit
- Elastic platy/micaceous, or as rounded pellets/aggregates
- Mineral.cleavage
- Perfect [001]
- Mineral.mohs
- 2
- Mineral.luster
- Dull, earthy
- Mineral.refractive
- nα = 1.590 – 1.612 nβ = 1.609 – 1.643 nγ = 1.610 – 1.644
- Mineral.opticalprop
- Biaxial (-); moderate relief
via Wikipedia infobox
Wikidata facts
- Image
- Mineraly.sk - glaukonit.jpg
Show 5 more facts
- Nickel-Strunz 9th edition (updated 2009)
- 9.EC.15
- Commons category
- Glauconite
- Mohs' hardness
- 2
- IMA Mineral Symbol
- Glt
- Strunz 8th edition (series ID, updated)
- VIII/E.05a
via Wikidata · CC0
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Article
5 sectionsContents
- Occurrence
- Uses
- Fertilizers
- Hazards
- References
Glauconite is an iron potassium phyllosilicate (mica group) mineral of characteristic green color which is very friable and has very low weathering resistance.
It crystallizes with a monoclinic geometry. Its name is derived from the Greek () meaning 'bluish green', referring to the common blue-green color of the mineral; its sheen (mica glimmer) and blue-green color. Its color ranges from olive green, black green to bluish green, and yellowish on exposed surfaces due to oxidation. In the Mohs scale it has a hardness of 2, roughly the same as gypsum. The relative specific gravity range is 2.4–2.95. It is normally found as dark green rounded concretions with the dimensions of a sand grain. It can be confused with chlorite (also of green color) or with a clay mineral. Glauconite has the chemical formula .