Chrysocolla Mineral Data

Chrysocolla Mineral Data +

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General Chrysocolla Information

Chemical Formula:

(Cu,Al)2H2Si2O5(OH)4·n(H2O)

Composition:

Molecular Weight = 328.42 gm

Aluminum 2.05 % Al 3.88 % Al₂O₃

Copper 33.86 % Cu 42.39 % CuO

Silicon 17.10 % Si 36.59 % SiO₂

Hydrogen 1.92 % H 17.14 % H₂O

Oxygen 45.06 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu_1.75Al_0.25H_1.75(Si₂O₅)(OH)₄·0.25(H₂O)

Environment:

Mineral of secondary origin commonly associated with other secondary copper minerals.

IMA Status:

Valid Species (Pre-IMA) 315 BC

Locality:

Nizhne-Tagilsk, Ural Mountains, Russia Link to MinDat.org Location Data.

Name Origin:

Named from the Greek chrysos - "gold" and kolla - "glue" in allusion to the name of the material used to solder gold.

Synonym:

Bisbeeite

Chrysocolla Image

Images:

Chrysocolla

Comments: Botryoidal chrysocolla lining a vug.
Location: Inca del Oro, Copiap?, Chile. Scale: 7.5 x 6 cm.
© Fabre Minerals

Images:

Chrysocolla Cuprite

Comments: Semi-metallic, dark reddish gray, cuprite crystals on blue chrysocolla.
Location: Mashamba West mine, Shaba, Congo. Scale: 7.5 x 4.7 x 2.3 cm.
© Fabre Minerals

Images:

Chrysocolla Tenorite

Comments: Lustrous black botryoidal Tenorite mostly covering a sky-blue massive chrysocolla matrix.
Location: 79 mine, Banner district, Pinal Co., Arizona. Scale: 5.5 x 3 cm.
© Dan Weinrich

Chrysocolla Crystallography

Axial Ratios:

a:b:c =0.6404:1:0.7528

Cell Dimensions:

a = 5.7, b = 8.9, c = 6.7, Z = 1; V = 339.89 Den(Calc)= 1.60

Crystal System:

OrthorhombicSpace Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.494(1), 2.92(0.8), 8.3(0.6),

Physical Properties of Chrysocolla

Cleavage:

None

Color:

Green, Bluish green, Blue, Blackish blue, Brown.

Density:

1.9 - 2.4, Average = 2.15

Diaphaniety:

Translucent to opaque

Fracture:

Brittle - Sectile - Brittle fracture with slightly sectile shavings possible.

Habit:

Botryoidal - "Grape-like" rounded forms (e.g.. malachite).

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Habit:

Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).

Hardness:

2.5-3.5 - Finger Nail-Copper Penny

Luminescence:

None.

Luster:

Vitreous - Dull

Streak:

light green

Optical Properties of Chrysocolla

Dichroism (e):

colorless.

Dichroism (w):

pale blue green.

Gladstone-Dale:

CI meas= -0.19 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.599 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.343,KPDmeas= 0.2553,KC= 0.2145

Optical Data:

Uniaxial (+), w=1.46, e=1.57, bire=0.1380-0.1750.

Calculated Properties of Chrysocolla

Electron Density:

r_electron=2.12 gm/cc
note: r_Chrysocolla=2.15 gm/cc.

Fermion Index

Fermion Index = 0.0082
Boson Index = 0.9918

Photoelectric:

PE_Chrysocolla= 15.21 barns/electron
U=PE_Chrysocolla x r_electron= 32.32 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chrysocolla is Not Radioactive

Chrysocolla Classification

Dana Class:

74.3.2.1 (74)Phyllosilicate Modulated Layers

(74.3)with joined strips

(74.3.2)Dana Group

74.3.2.1 Chrysocolla (Cu,Al)2H2Si2O5(OH)4·n(H2O) Unk Ortho

Strunz Class:

VIII/E.21-20 VIII - Silicates

VIII/E - Cyklosilicates, six rings [Si6O18]12-

VIII/E.21 - Dioptase - Chrysocolla series

VIII/E.21-10 Dioptase CuSiO2(OH)2 R 3 3

VIII/E.21-20 Chrysocolla (Cu,Al)2H2Si2O5(OH)4·n(H2O) Unk Ortho

Other Chrysocolla Information

References:

NAME( Ford32) PHYS. PROP.(Ford32) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Chrysocolla :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - Franklin Minerals(Dunn)
5 - Glendale Community College
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - MinMax(Deutsch)
12 - MinMax(English)
13 - Mineralienatlas (Deutsch)
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - Scandinavian mineral gallery
17 - Tradeshop.com - The Rainbow of Gems
18 - theimage

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Print or Cut-and-Paste your Chrysocolla Specimen Label here :

Chrysocolla

(Cu,Al)2H2Si2O5(OH)4·n(H2O)
Dana No: 74.3.2.1 Strunz No: VIII/E.21-20
Locality:

Notes: