Magnesiohulsite
A valid IMA mineral species
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About Magnesiohulsite
Formula:
Mg2Fe3+O2(BO3)
May contain minor Fe(II) replacing Mg and minor Sn and Mg replacing Fe(III).
Colour:
Black, bluish-grey, greyish white in reflect light.
Lustre:
Sub-Metallic
Hardness:
6
Specific Gravity:
4.18
Crystal System:
Monoclinic
Member of:
Name:
For its relation to hulsite.
Unique Identifiers
Mindat ID:
2498
Long-form identifier:
mindat:1:1:2498:9
IMA Classification of Magnesiohulsite
Approved
Approval year:
1983
Classification of Magnesiohulsite
6.AB.45
6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
24.2.3.2
24 : ANHYDROUS BORATES
2 : A2BO2[XO3]
24 : ANHYDROUS BORATES
2 : A2BO2[XO3]
9.6.5
9 : Borates
6 : Borates of Ti, Sn and Ta
9 : Borates
6 : Borates of Ti, Sn and Ta
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Mhul | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Magnesiohulsite
Sub-Metallic
Transparency:
Opaque
Colour:
Black, bluish-grey, greyish white in reflect light.
Streak:
Dark brown
Hardness:
6 on Mohs scale
Hardness:
VHN50=689 - 825 kg/mm2 - Vickers
Tenacity:
Brittle
Density:
4.18(2) g/cm3 (Measured) 4.15 g/cm3 (Calculated)
Optical Data of Magnesiohulsite
Type:
Biaxial
RI values:
nα = 1.88 nγ = 1.95
Max. Birefringence:
δ = 0.070
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Anisotropism:
strong
Dispersion:
relatively strong
Colour in reflected light:
bluish gray to grayish white
Pleochroism:
Strong
Comments:
X = dark brown; Y = dark green.
Chemistry of Magnesiohulsite
Mindat Formula:
Mg2Fe3+O2(BO3)
May contain minor Fe(II) replacing Mg and minor Sn and Mg replacing Fe(III).
May contain minor Fe(II) replacing Mg and minor Sn and Mg replacing Fe(III).
Element Weights:
Elements listed:
Crystallography of Magnesiohulsite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/m
Setting:
P2/m
Cell Parameters:
a = 10.70(10) Å, b = 3.06(3) Å, c = 5.45(5) Å
β = 94.6°
β = 94.6°
Ratio:
a:b:c = 3.497 : 1 : 1.781
Unit Cell V:
177.87 ų (Calculated from Unit Cell)
Z:
2
Twinning:
On {101}
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.665 Å | (10) |
| 2.563 Å | (9) |
| 2.467 Å | (8) |
| 2.018 Å | (8) |
| 5.32 Å | (7) |
| 2.129 Å | (6) |
| 1.9653 Å | (6) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) |
Type Occurrence of Magnesiohulsite
General Appearance of Type Material:
needlelike crystals
Geological Setting of Type Material:
magnesium skarn borate deposit
Associated Minerals at Type Locality:
Synonyms of Magnesiohulsite
Other Language Names for Magnesiohulsite
Dutch:Magnesiohulsiet
German:Magnesiohulsit
Russian:Магнезиогулцит
Simplified Chinese:黑硼锡镁矿
Spanish:Magnesiohulsita
Traditional Chinese:黑硼錫鎂礦
Relationship of Magnesiohulsite to other Species
Member of:
Other Members of Pinakiolite Group:
| Aluminomagnesiohulsite | (Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2 | Mon. 2/m : P2/m |
| Folvikite | Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4 | Mon. 2 : P2 |
| Hulsite | Fe2+2Fe3+O2(BO3) | Mon. 2/m : P2/m |
| Pinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 | Mon. 2/m : B2/m |
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 6.AB. | Chubarovite | KZn2(BO3)Cl2 |
| 6.AB. | Rhabdoborite-(Mo) | Mg12Mo6+1.33O6(BO3)6F2 |
| 6.AB.05 | Hambergite | Be2(BO3)(OH) |
| 6.AB.10 | Berborite | Be2(BO3)(OH) · H2O |
| 6.AB.15 | Jeremejevite | Al6(BO3)5(F,OH)3 |
| 6.AB.20 | Yuanfuliite | Mg(Fe3+,Al)O(BO3) |
| 6.AB.20 | Warwickite | (Mg,Ti,Fe,Al)2O(BO3) |
| 6.AB.25 | Karlite | (Mg,Al)6.5(BO3)3(OH)4(◻,Cl)0.5 |
| 6.AB.30 | Marinaite | Cu2Fe3+O2(BO3) |
| 6.AB.30 | Savelievaite | Mg2Cr3+O2(BO3) |
| 6.AB.30 | Fredrikssonite | Mg2Mn3+O2(BO3) |
| 6.AB.30 | Vonsenite | Fe2+2Fe3+(BO3)O2 |
| 6.AB.30 | Ludwigite | Mg2Fe3+(BO3)O2 |
| 6.AB.30 | Azoproite | (Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2 |
| 6.AB.30 | Bonaccordite | Ni2Fe3+(BO3)O2 |
| 6.AB.35 | Folvikite | Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4 |
| 6.AB.35 | Pinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 |
| 6.AB.40 | Takéuchiite | (Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2 |
| 6.AB.40 | Blatterite | Sb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32 |
| 6.AB.40 | Orthopinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 |
| 6.AB.40 | Chestermanite | Mg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2 |
| 6.AB.45 | Aluminomagnesiohulsite | (Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2 |
| 6.AB.45 | Hulsite | Fe2+2Fe3+O2(BO3) |
| 6.AB.50 | Fluoborite | Mg3(BO3)(F,OH)3 |
| 6.AB.50 | Hydroxylborite | Mg3(BO3)(OH)3 |
| 6.AB.55 | Shabynite | Mg5(BO3)(OH)5(Cl,OH)2 · 4H2O |
| 6.AB.55 | Wightmanite | Mg5(BO3)O(OH)5 · 2H2O |
| 6.AB.60 | Gaudefroyite | Ca4Mn3+2-3(BO3)3(CO3)(O,OH)3 |
| 6.AB.65 | Sakhaite | Ca48Mg16(BO3)32(CO3)16 · 2(H2O,HCl) |
| 6.AB.70 | Harkerite | Ca48Mg16[AlSi4O15(OH)]4(BO3)16(CO3)16 · 2(H2O,HCl) |
| 6.AB.75 | Pertsevite-(F) | Mg2(BO3)(F,OH) |
| 6.AB.75 | Pertsevite-(OH) | Mg2(BO3)(OH) |
| 6.AB.80 | Jacquesdietrichite | Cu2(H2BO3)(OH)3 |
| 6.AB.85 | Rhabdoborite-(V) | Mg12(V5+,Mo6+,W6+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} (x < 1) |
| 6.AB.85 | Rhabdoborite-(W) | Mg12(W6+,V5+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} |
| 6.AB.85 | Painite | CaZrAl9(BO3)O15 |
| 6.AB.90 | Mengxianminite | (Ca,Na)2Sn2(Mg,Fe)3Al8[(BO3)(BeO4)O6]2 |
Other Information
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 Magnesiohulsite
mindat.org URL:
https://www.mindat.org/min-2498.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Magnesiohulsite
Reference List:
Localities for Magnesiohulsite
Showing 4 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Australia | |
| R Bottrill |
China (TL) | |
| Yang Guangming et al. (1985) +1 other reference |
Russia | |
| RRUFF Specimen ID: R070223 |
USA | |
| Aleksandrov (1974b) |
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Iten'yurginskoye Deposit, Chukotsky District, Chukotka Autonomous Okrug, Russia