Paralaurionite

Paralaurionite
Paralaurionite
	Platey clear paralaurionite crystals from slag in the Thorikos area, Lavrion, Attica, Greece
General
Category	Halide mineral
Formula; (repeating unit)	PbCl(OH)
IMA symbol	Plri
Strunz classification	3.DC.05
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) ; (same H-M symbol)
Space group	C2/m
Unit cell	a = 10.865(4) Å, ; b = 4.006(2) Å, ; c = 7.233(3) Å; ; β = 117.24(4)°; Z = 4
Identification
Color	Colorless, white, pale greenish, yellowish, yellow-orange, rarely violet
Crystal habit	Elongated tabular crystals
Twinning	Contact twinning on {100}
Cleavage	Perfect on {001}
Tenacity	Flexible, non-elastic
Mohs scale hardness	3
Luster	Subadamantine
Diaphaneity	Transparent to translucent
Specific gravity	6.05–6.15
Optical properties	Biaxial (-)
Refractive index	nα = 2.050 nβ = 2.150 nγ = 2.200
Birefringence	δ = 0.150
Pleochroism	Visible
References

Paralaurionite is a colorless mineral consisting of a basic lead chloride PbCl(OH) that is dimorphous with laurionite. It is a member of the matlockite group.^[6] The name is derived from para-, the Greek for "near", and laurionite, because of its polymorphic relationship to it.^[4] Bright, yellow tips of can form on paralaurionite crystals and paralaurionite may also be intergrown with mendipite.^[7]^[8]

Occurrence[]

It was first described in 1899 for an occurrence in slag in Laurium, Attica, Greece.^[3] In 1952 an occurrences of it was reported from the Mammoth Mine, Arizona.^[9]

It occurs in lead bearing slag which has been exposed to seawater. It also occurs in polymetallic ore deposits. It occurs associated with laurionite, , , phosgenite in slag deposits; and with leadhillite, matlockite, cerussite, hydrocerussite, diaboleite and in the Mammoth mine location.^[3]

References[]

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85: 291–320.
^ Mineralienatlas
^ ^a ^b ^c Handbook of Mineralogy
^ ^a ^b Paralaurionite on Mindat.org
^ Paralaurionite on Webmineral
^ Mineralogical magazine. Mineralogical Society, HighWire Press. 1 January 2006. pp. 643–8. Retrieved 26 January 2012.
^ The Mineralogical record. 1986. pp. 185–88. Retrieved 26 January 2012.
^ Williams, Peter A. (August 1990). Oxide zone geochemistry. E. Horwood. pp. 262–4. ISBN 978-0-13-647553-8. Retrieved 26 January 2012.
^ Mineralogical Society (Great Britain) (1952). The Mineralogical magazine and journal of the Mineralogical Society. Mineralogical Society. pp. 341–2. Retrieved 26 January 2012.

Unusually large crystals of Paralaurionite, Touissit, Oujda-Angad Province, Morocco. Size: 6 x 5.5 x 5 cm.

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[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85: 291–320.

[2] Mineralienatlas

[HBM-3] Handbook of Mineralogy

[Mindat-4] Paralaurionite on Mindat.org

[Webmin-5] Paralaurionite on Webmineral

[Britain)Press2006-6] Mineralogical magazine. Mineralogical Society, HighWire Press. 1 January 2006. pp. 643–8. Retrieved 26 January 2012.

[The_Mineralogical_record-7] The Mineralogical record. 1986. pp. 185–88. Retrieved 26 January 2012.

[Williams1990-8] Williams, Peter A. (August 1990). Oxide zone geochemistry. E. Horwood. pp. 262–4. ISBN 978-0-13-647553-8. Retrieved 26 January 2012.

[Britain)1952-9] Mineralogical Society (Great Britain) (1952). The Mineralogical magazine and journal of the Mineralogical Society. Mineralogical Society. pp. 341–2. Retrieved 26 January 2012.

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