Jacobsite (original) (raw)

Colour:

Black, gray in reflected light

Lustre:

Resinous, Sub-Metallic

Name:

Named in 1869 by Augustin Alexis Damour for the type locality of Jakobsberg, Sweden.

Long-form identifier:

mindat:1:1:2061:5

892983cc-9dec-4591-87b8-15cc4e9ac022

Approved, 'Grandfathered' (first described prior to 1959)

Type description reference:

4.BB.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
B : With only medium-sized cations

7.2.2.2

7 : MULTIPLE OXIDES
2 : AB2X4

7.19.3

7 : Oxides and Hydroxides
19 : Oxides of Mn and Fe

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

Colour:

Black, gray in reflected light

Fracture:

Irregular/Uneven, Sub-Conchoidal

Density:

4.76 g/cm3 (Measured) 5.03 g/cm3 (Calculated)

Colour in reflected light:

Gray-white with olive tint

Internal Reflections:

Brown

Pleochroism:

Non-pleochroic

Mindat Formula:

Mn2+Fe3+2O4

Class (H-M):

m_3_m _(_4/_m_32/m ) - Hexoctahedral

Cell Parameters:

a = 8.457 Å

Unit Cell V:

604.85 ų (Calculated from Unit Cell)

Morphology:

Octahedral. Rarely found as crystals. Massive, granular.

Crystal Atlas:

Image Loading

3d models and HTML5 code kindly provided bywww.smorf.nl.

Toggle
Edge Lines |Miller Indices |Axes

Transparency
Opaque |Translucent |Transparent

View
Along a-axis |Along b-axis |Along c-axis |Start rotation |Stop rotation

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

Epitaxy Comments:

Oriented intergrowths (Vredenbergite).

Place of Conservation of Type Material:

Swedish Museum of Natural History, Stockholm, Sweden.

Reference:

Damour, A.A. (1869) Notice sur la jakobsite, nouvelle espèce minérale. Comptes Rendus Hebdomadaires des Séances de l’Académie des Sciences: 69: 168-172.

Other Members of this group:

Associated Minerals Based on Photo Data:

Not fluorescent in ultraviolet

Health Risks:

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

Reference List:

Peter, J., Trapp, M., Lauterbach, S., Gollé-Leidreiter, P., Kolb, U., Kleebe, H.-J. (2021): Exomorphism of Jacobsite Precipitates in Bixbyite Single Crystals from the Thomas Range in Utah. American Mineralogist: 106(7): 1163-1171.

Wen, Shanshan, Chen, Bing, Zhang, Junhong, Zhan, Wenlong, He, Zhijun, Gao, Lihua (2023) Systematic Study on the Synthesis and Magnetism Properties of Manganese Ferrite MnFe2O4 by an Oxidation Roasting Process. Crystals, 13 (10) doi:10.3390/cryst13101509

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.

- 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.