Ferrarisite (original) (raw)

A valid IMA mineral species

About FerrarisiteHide

This section is currently hidden. Click the show button to view.

Formula:

Ca5(AsO4)2(HAsO4)2 · 9H2O

Colour:

Colorless to white

Lustre:

Sub-Vitreous, Silky

Name:

Named in honour of professor Giovanni Ferraris (1937- ), Institute of Mineralogy, Crystallography and Geochemistry, University of Turin, Italy, who worked on crystal structure of several arsenate minerals from Sainte-Marie-aux-Mines, France.

Ferrarisite dehydrates very slowly in dry air at room temperature and turns from colourless to white; dehydrated crystals were also found in nature in Sainte Marie aux Mines and in Wittichen (Catti & Ivaldi, 1981). Fresh ferrarisite is visually very similar to pharmacolite.

A triclinic compound with the formula Ca5(AsO4)2(HAsO4).2.5H2O (Unnamed (Ca arsenate hydrate)) was obtained by dehydration at 60°C of ferrarisite (Catti & Ivaldi, 1981).

A closely related mineral is vladimirite.

Unique IdentifiersHide

This section is currently hidden. Click the show button to view.

Long-form identifier:

mindat:1:1:1485:0

836c8301-c56b-4402-aa4f-f37ba90998ae

IMA Classification of FerrarisiteHide

This section is currently hidden. Click the show button to view.

IMA Formula:

Ca5(AsO3OH)2(AsO4)2 · 9H2O

Classification of FerrarisiteHide

This section is currently hidden. Click the show button to view.

8.CJ.30

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations

39.2.3.1

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O

20.2.12

20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba

Mineral SymbolsHide

This section is currently hidden. Click the show button to view.

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of FerrarisiteHide

This section is currently hidden. Click the show button to view.

Transparency:

Transparent, Translucent

Colour:

Colorless to white

Comment:

White mineral may be dehydrated to unspecified minerals

Cleavage:

Perfect
{001} perfect

Density:

2.63 g/cm3 (Measured) 2.60 g/cm3 (Calculated)

Optical Data of FerrarisiteHide

This section is currently hidden. Click the show button to view.

RI values:

_n_α = 1.562 _n_β = 1.572 _n_γ = 1.585

2V:

Measured: 83° , Calculated: 84°

δ = 0.023

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Optical Extinction:

X ^ c = 8°-17°; Z perpendicular to {110}

Pleochroism:

Non-pleochroic

Chemistry of FerrarisiteHide

This section is currently hidden. Click the show button to view.

Mindat Formula:

Ca5(AsO4)2(HAsO4)2 · 9H2O

Crystallography of FerrarisiteHide

This section is currently hidden. Click the show button to view.

Class (H-M):

1 - Pinacoidal

Cell Parameters:

a = 8.294 Å, b = 6.722 Å, c = 11.198 Å
α = 106.16°, β = 92.94°, γ = 99.20°

Ratio:

a:b:c = 1.234 : 1 : 1.666

Unit Cell V:

588.90 ų (Calculated from Unit Cell)

Comment:

Bull Min. (1980): 103:541 structure

Crystal StructureHide

This section is currently hidden. Click the show button to view.

Load
Unit Cell |Unit Cell Packed
2x2x2 |3x3x3 |4x4x4

Show
Big Balls |Small Balls |Just Balls |Spacefill
Polyhedra Off |Si Polyhedra |All Polyhedra
Remove metal-metal sticks

Display Options
Black Background |White Background
Perspective On |Perspective Off
2D |Stereo |Red-Blue |Red-Cyan

View
CIF File Best |x |y |z |a |b |c

Rotation
Stop |Start

Labels
Console Off |On |Grey |Yellow

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

This section is currently hidden. Click the show button to view.

Powder Diffraction Data:

Geological EnvironmentHide

This section is currently hidden. Click the show button to view.

Type Occurrence of FerrarisiteHide

This section is currently hidden. Click the show button to view.

General Appearance of Type Material:

White radiating very elongated crystals.

Geological Setting of Type Material:

Oxidized vein assemblages in arsenic-rich mines

Associated Minerals at Type Locality:

Synonyms of FerrarisiteHide

This section is currently hidden. Click the show button to view.

Other Language Names for FerrarisiteHide

This section is currently hidden. Click the show button to view.

Common AssociatesHide

This section is currently hidden. Click the show button to view.

Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

This section is currently hidden. Click the show button to view.

Fluorescence of FerrarisiteHide

This section is currently hidden. Click the show button to view.

Other InformationHide

This section is currently hidden. Click the show button to view.

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for FerrarisiteHide

This section is currently hidden. Click the show button to view.

References for FerrarisiteHide

This section is currently hidden. Click the show button to view.

Localities for FerrarisiteHide

This section is currently hidden. Click the show button to view.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

This section is currently hidden. Click the show button to view.

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.