Evanichite
A valid IMA mineral species
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About Evanichite
Dan Evanich (evanichite)
Formula:
Pb6Cr3+(Cr6+O4)2(SO4)(OH)7FCl
Colour:
orange-brown to red-brown
Lustre:
Adamantine
Hardness:
2½ - 3
Specific Gravity:
5.878 (Calculated)
Crystal System:
Trigonal
Name:
Named in honor of Daniel J. Evanich (b. 1951), a long time field collector of Western U.S. minerals and a self-taught amateur mineralogist with a special interest in the mining history and minerals from Butte, Montana, and Tiger, Arizona. Dan is an active member of Bay Area Mineralogists (BAM) of Northern California having served as former Field Trip Coordinator for a period of more than 10 years. He is also an active member of both Mineralogical Society of Southern California (MSSC) and Northern California Mineralogical Association (NCMA). Daniel has kindly and generously donated or provided a number of samples to the RRUFF Project (http://rruff.info) for data collections and research, including the evanichite specimen.
New structure type.
The first natural chromium(III) chromate to date with heterovalent chromium mineral.
Unique combination of elements (at the upload time).
The first natural chromium(III) chromate to date with heterovalent chromium mineral.
Unique combination of elements (at the upload time).
Unique Identifiers
Mindat ID:
56063
Long-form identifier:
mindat:1:1:56063:2
GUID
(UUID V4):
(UUID V4):
1b0ab0c4-b1f3-41da-bf57-f84df674b89c
IMA Classification of Evanichite
Classification of Evanichite
7.BD.
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
D : With only large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
D : With only large cations
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 |
|---|---|---|
| Eva | 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 Evanichite
Adamantine
Transparency:
Transparent
Colour:
orange-brown to red-brown
Streak:
white
Hardness:
2½ - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{100}
{100}
Density:
5.878 g/cm3 (Calculated)
Chemistry of Evanichite
Mindat Formula:
Pb6Cr3+(Cr6+O4)2(SO4)(OH)7FCl
Crystallography of Evanichite
Crystal System:
Trigonal
Class (H-M):
3 - Pyramidal
Space Group:
P3
Cell Parameters:
a = 7.7588(5) Å, c = 9.6161(6) Å
Ratio:
a:c = 1 : 1.239
Unit Cell V:
501.32 ų (Calculated from Unit Cell)
Z:
1
Twinning:
none observed
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.805 Å | (30) |
| 3.599 Å | (100) |
| 3.023 Å | (45) |
| 2.473 Å | (42) |
| 2.245 Å | (28) |
| 2.045 Å | (17) |
| 2.033 Å | (18) |
| 1.903 Å | (12) |
Type Occurrence of Evanichite
General Appearance of Type Material:
short prismatic crystals on top of the quartz matrix. Individual crystals are up to 0.70 x 0.20 x
0.20 mm in size.
0.20 mm in size.
Place of Conservation of Type Material:
University of Arizona, Alfie Norville Gem and Mineral Museum, 115 N Church Ave Ste 121, Tucson, AZ 85701, USA, catalogue no. 22718 (holotype), and the RRUFF Project, deposition no. R220006 (cotype)
Geological Setting of Type Material:
epithermal deposit
Associated Minerals at Type Locality:
Synonyms of Evanichite
Common Associates
Associated Minerals Based on Photo Data:
| 5 photos of Evanichite associated with Diaboleite | Pb2CuCl2(OH)4 |
| 5 photos of Evanichite associated with Quartz | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 7.BD. | Adanite | Pb2(Te4+O3)(SO4) |
| 7.BD. | Hasanovite | KNa(MoO2)(SO4)2 |
| 7.BD. | Kennygayite | [Pb4O2(OH)2](SO4) |
| 7.BD.05 | Sulphohalite | Na6(SO4)2FCl |
| 7.BD.10 | Galeite | Na15(SO4)5F4Cl |
| 7.BD.10 | Schairerite | Na21(SO4)7ClF6 |
| 7.BD.15 | Kogarkoite | Na3(SO4)F |
| 7.BD.20 | Caracolite | Na3Pb2(SO4)3Cl |
| 7.BD.20 | Cesanite | Na3Ca2(SO4)3(OH) |
| 7.BD.20 | Aiolosite | Na4Bi(SO4)3Cl |
| 7.BD.25 | Burkeite | Na6(CO3)(SO4)2 |
| 7.BD.30 | Hanksite | Na22K(SO4)9(CO3)2Cl |
| 7.BD.35 | Cannonite | Bi2(SO4)O(OH)2 |
| 7.BD.40 | Lanarkite | Pb2(SO4)O |
| 7.BD.45 | Grandreefite | Pb2(SO4)F2 |
| 7.BD.50 | Itoite | Pb3Ge4+(SO4)2O2(OH)2 |
| 7.BD.55 | Chiluite | Bi3Te6+Mo6+O10.5 |
| 7.BD.60 | Hectorfloresite | Na9(SO4)4(IO3) |
| 7.BD.65 | Pseudograndreefite | Pb6(SO4)F10 |
| 7.BD.70 | Sundiusite | Pb10(SO4)O8Cl2 |
Other Information
Notes:
insoluble in water or hydrochloric acid.
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 Evanichite
mindat.org URL:
https://www.mindat.org/min-56063.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Evanichite
Localities for Evanichite
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.
USA (TL) | |
| Miyawaki et al. (2022) |
Mammoth-Saint Anthony Mine, St. Anthony deposit, Tiger, Mammoth Mining District, Pinal County, Arizona, USA