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Minyulo Well, Dandaragan, Dandaragan Shire, Western Australia, Australiai
Regional Level Types
Minyulo WellWell
Dandaragan- not defined -
Dandaragan ShireShire
Western AustraliaState

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Latitude & Longitude (WGS84):
30° 41' 12'' South , 115° 39' 42'' East
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
Dandaragan412 (2013)4.1km
Moora1,770 (2012)33.1km
Barberton164 (2013)35.1km
Lancelin666 (2012)48.5km

Type locality for Minyulite discovered July 1932, and described by E.S Simpson and C.R. Le Mesurier. Rare phosphate species. Occurs here as translucent white crystalline aggregates on phosphate ironstone. Rare species dealers have sold material from the site. The best for the species though is Toms Quarry in South Australia. Dandaragan is a small town 150 kilometres north of Perth. The name is Aboriginal for 'good kangaroo country'. It borders the northern limestone heathlands region, and the remnants of the northern Darling Ranges.

The writer looked up the original reference which was retrieved from the historic archives at the State Library of Western Australia. Government geologist, Simpson, originally found a small amount of material he thought was wavellite. He regretted not collecting more, as back at the laboratory it turned out to be a new species. Described as being on Crown Grant 1110, adjacent to the Minyulo Estate, near Minyulo Well.

The area is described as containing distinct horizontal beds of glauconitic and non-glauconitic sands, clays with a chalk bed ontop. At the base of the chalk is a thin bed of nodular apatite. The outcrop studied showed considerable secondary chemical alteration from the decomposition of glauconite and possibly other iron compounds, resulting in the formation of much limonite, found on the surface as iron stained sand, ferruginous sandstone, and hard siliceous ironstone. Some of this iron had taken the place of lime in combination with the phosphoric oxide to produce bright green dufrenite which was plentiful in the outcrop.

The outcrop also contained a small amount of fibrous material in hard phosphatic ironstone carrying partly altered apatite nodules. At the location minyulite occurs as minute veins and cavities in a highly phosphatic ironstone bed, 3-4 feet thick (original reference imperial), and the horizontal outcrop forms the summit of a low cliff of ferruginous ironstone. The phosphatic rock contains limonite, quartz grains, dufrenite, nodular apatite, and glauconite grains. At the greensand-chalk contact are coprolites (fossilized animal dung where much of the composition has been replaced by minerals). Above the cliff is a gently grassy slope of chalk in turn capped by a second bed of limonitised greensand.

Minyulite at the location was described as being distinct crystalline, forming dense radiating groups of fine fibres, completely filling cavities, or forming mammilliated crusts close to the cavities. In very narrow cavities on flat faces the crystals, 2-5mm long, form rossettes not unlike wavellite. The species was described as fragile with a hardness of 3.5, specific gravity 2.45 (average from only two specimens), colourless to milky white, translucent, crystals up to 3mm thick. The type specimen was given to the Western Australian Museum, and a paratype specimen to the British Museum.

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Standard Detailed Strunz Dana Chemical Elements

Mineral List

3 valid minerals. 1 (TL) - type locality of valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

Detailed Mineral List:

Formula: Ca5(PO4)3(Cl/F/OH)
Reference: Journal of the Royal Society of Western Australia, Vol 19, p13, ES Simpson and CR Le Mesurier.
Formula: Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O
Reference: Collection of NHM, Vienna
Formula: (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
Reference: Journal of the Royal Society of Western Australia, Vol 19, p13, ES Simpson and CR Le Mesurier.
Formula: (Fe,O,OH,H2O)
Reference: Journal of the Royal Society of Western Australia, Vol 19, p13, ES Simpson and CR Le Mesurier.
Minyulite (TL)
Formula: KAl2(PO4)2(OH,F) · 4H2O
Type Locality:
Reference: Simpson and Le Mesurier (1933) Journal of the Royal Society of Western Australia: 19: 13; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 970; American Mineralogist (1977): 62: 256-262.
Formula: SiO2
Reference: Journal of the Royal Society of Western Australia, Vol 19, p13, ES Simpson and CR Le Mesurier.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Group 8 - Phosphates, Arsenates and Vanadates
Dufrénite8.DK.15Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O
Minyulite (TL)8.DH.05KAl2(PO4)2(OH,F) · 4H2O
Unclassified Minerals, Rocks, etc.

List of minerals arranged by Dana 8th Edition classification

Dufrénite42.9.1.2Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O
Minyulite (TL),F) · 4H2O
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Unclassified Minerals, Mixtures, etc.

List of minerals for each chemical element

H MinyuliteKAl2(PO4)2(OH,F) · 4H2O
H DufréniteCa0.5Fe2+Fe53+(PO4)4(OH)6 · 2H2O
H Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
H ApatiteCa5(PO4)3(Cl/F/OH)
H Limonite(Fe,O,OH,H2O)
O MinyuliteKAl2(PO4)2(OH,F) · 4H2O
O DufréniteCa0.5Fe2+Fe53+(PO4)4(OH)6 · 2H2O
O Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
O QuartzSiO2
O ApatiteCa5(PO4)3(Cl/F/OH)
O Limonite(Fe,O,OH,H2O)
F MinyuliteKAl2(PO4)2(OH,F) · 4H2O
F ApatiteCa5(PO4)3(Cl/F/OH)
Na Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
Mg Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
Al MinyuliteKAl2(PO4)2(OH,F) · 4H2O
Al Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
Si Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
Si QuartzSiO2
P MinyuliteKAl2(PO4)2(OH,F) · 4H2O
P DufréniteCa0.5Fe2+Fe53+(PO4)4(OH)6 · 2H2O
P ApatiteCa5(PO4)3(Cl/F/OH)
Cl ApatiteCa5(PO4)3(Cl/F/OH)
K MinyuliteKAl2(PO4)2(OH,F) · 4H2O
K Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
Ca DufréniteCa0.5Fe2+Fe53+(PO4)4(OH)6 · 2H2O
Ca ApatiteCa5(PO4)3(Cl/F/OH)
Fe DufréniteCa0.5Fe2+Fe53+(PO4)4(OH)6 · 2H2O
Fe Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
Fe Limonite(Fe,O,OH,H2O)


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
E.S. Simpson and C.R. Le Mesurier (1933): Journal of the Royal Society of Western Australia (1933):19:13.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged (1951):1124:970.
Kampf, A.R. (1977): Minyulite: its atomic arrangement. American Mineralogist(1977):62: 256–262.

Other Regions, Features and Areas containing this locality

Australian PlateTectonic Plate

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