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Demons Bluff, Anglesea, Surf Coast Shire, Victoria, Australia

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Latitude & Longitude (WGS84): 38° 23' 51'' South , 144° 14' 16'' East
Latitude & Longitude (decimal): -38.39750,144.23778
GeoHash:G#: r1ntd1ywr
Köppen climate type:Cfb : Temperate oceanic climate


Demons Bluff is approx. 2 km east of Anglesea.

Vivianite nodules up to 200mm across have been found here washed ashore from submarine outcrops of black carbonaceous and pyritic Anglesea Sand Beds. It is thought that the vivianite formation, sulphate reduction and precipitation of pyrite all require strongly reducing conditions, under which pyrite may simultaneously precipitate with phosphate.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


3 valid minerals.

Detailed Mineral List:

Pyrite
Formula: FeS2
Reference: Steve Sorrell Collection
Siderite
Formula: FeCO3
Description: The siderite at Demons Bluff has been found as small (less than 0.5mm) tan colored, double terminated crystals on vivianite crystals inside the vivianite nodules.
Reference: Peter Hall collection
Vivianite
Formula: Fe2+3(PO4)2 · 8H2O
Description: The vivianite nodules from Demons Bluff occur in 2 forms- crystalline and non-crystalline. The crystalline nodules when opened are generally dark blue and have a crystalline structure radiating towards the centre. Some of these nodules have cavities towards the centre which are lined with dark blue green stubby crystals of vivianite usually no more than 3mm across. The non-crystalline nodules (which are the most common form at Demons Bluff) are massive and compact and when first exposed to light can be very pale green-white. In time they turn darker blue/green. However polished specimens (which best display the patchy/mottled structure of the nodule) tend to hold the original colour.
Reference: Geological Survey of Victoria - 1979 - Memoirs - Issue 31 - Page 20

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
'Pyrite'2.EB.05aFeS2
Group 5 - Nitrates and Carbonates
'Siderite'5.AB.05FeCO3
Group 8 - Phosphates, Arsenates and Vanadates
'Vivianite'8.CE.40Fe2+3(PO4)2 · 8H2O

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Siderite14.1.1.3FeCO3
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
A3(XO4)2·xH2O
Vivianite40.3.6.1Fe2+3(PO4)2 · 8H2O

List of minerals for each chemical element

HHydrogen
H VivianiteFe32+(PO4)2 · 8H2O
CCarbon
C SideriteFeCO3
OOxygen
O SideriteFeCO3
O VivianiteFe32+(PO4)2 · 8H2O
PPhosphorus
P VivianiteFe32+(PO4)2 · 8H2O
SSulfur
S PyriteFeS2
FeIron
Fe PyriteFeS2
Fe SideriteFeCO3
Fe VivianiteFe32+(PO4)2 · 8H2O

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Tertiary
2.588 - 66 Ma



ID: 3190425
Cenozoic sedimentary rocks

Age: Cenozoic (2.588 - 66 Ma)

Lithology: Siltstone,mudstone,limestone,sandstone

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Oligocene - Eocene
23.03 - 56 Ma



ID: 859335
Demons Bluff Group

Age: Paleogene (23.03 - 56 Ma)

Stratigraphic Name: Demons Bluff Group

Description: Marine carbonaceous silty clay, basaltic slump deposits

Comments: argillaceous detrital sediment; synthesis of multiple published descriptions

Lithology: Argillaceous detrital sediment

Reference: Raymond, O.L., Liu, S., Gallagher, R., Zhang, W., Highet, L.M. Surface Geology of Australia 1:1 million scale dataset 2012 edition. Commonwealth of Australia (Geoscience Australia). [5]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Birch W.D., Henry, D.A. (1993) Phosphate Minerals of Victoria, The Mineralogical Society of Victoria Special Publication No. 3

External Links



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