Libethenite and Pseudomalachite

ID	448
Mineral	Libethenite Pseudomalachite
Location	Miguel Vacas Mine - Vila Viçosa - Évora - Portugal
Fluorescence	LW-UV: close SW-UV: close
Mindat.org	View Libethenite information at mindat.org View Pseudomalachite information at mindat.org

ID	2394
Long ID	1:1:2394:4
Formula	`Cu₂(PO₄)(OH)`
IMA Status	0 1
Occurrence	Polymetallic hydrothermal or deposit
Other Occurrences	Oxidized zones of copper deposits.
Discovery Year	1823
Diapheny	Transparent,Translucent
Cleavage	Very indistinct on {100} and {010}.
Tenacity	brittle
Colour	Light to dark green, blackish green, olive-green; bluish green to light green in transmitted light.
Hardness (min)	4.0
Hardness (max)	4.0
Lustre	Vitreous
About the name	Named in 1823 by August Breithaupt after the type locality - Ľubietová (Libethen in German, Libetbánya in Hungarian), Slovak Republic. Prior to 1919, the locality was in the territory of Hungary.
Streak	Light green
Crystal System	Orthorhombic
Cleavage Type	Poor/Indistinct
Fracture type	Irregular/Uneven,Conchoidal
Morphology	Crystals short prismatic or slightly elongated [100] with wedge-shaped terminations; also equant. {110} vertically grooved or striated, and {011} striated parallel to the edge with {111}.
Twinning	None observed.
UV	Not fluorescent in UV
Comment Luster	Somewhat greasy on fracture surfaces.
key_elements	0
shortcode_ima	Lib
Group	Olivenite Group

ID	3299
Long ID	1:1:3299:1
Formula	`Cu₅(PO₄)₂(OH)₄`
IMA Status	0 1
Other Occurrences	Oxidized zones of copper deposits.
Discovery Year	1813
Diapheny	Translucent
Cleavage	Imperfect on the {010}.
Colour	Blue-green, green, dark green, green-black; green to bluish green in transmitted light.
Hardness (min)	4.0
Hardness (max)	4.5
About the name	From the Greek ψευδής for "false" for its similarity to, but not being, malachite.
Streak	Blue-green
Crystal System	Monoclinic
Cleavage Type	Imperfect/Fair
Fracture type	Splintery,Conchoidal
Morphology	Usually occurs as botryoidal crusts; hemispherical aggregates of microscopic crystals; sub-parallel aggregates with a drusy surface. Individual crystals are rare, prismatic [001], usually with uneven faces; small, tabular crystals (Manto Cuba Mine, Chile). Also occurs as reniform, botryoidal or massive with a radial-fibrous structure and concentric banding, the fibers elongated [010]; foliated; microcrystalline or dense; colloform.
Twinning	On {100}.
UV	None.
key_elements	0
shortcode_ima	Pmlc

Price: € 10

Dimensions: Not registered

Weight: Not registered

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