|Latitude & Longitude (WGS84):||38° 23' 51'' South , 144° 14' 16'' East|
|Latitude & Longitude (decimal):||-38.39750,144.23778|
|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 TypeStandard Detailed Strunz Dana Chemical Elements
Detailed Mineral List:
| ⓘ Pyrite|
Reference: Steve Sorrell Collection
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
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|
|Group 5 - Nitrates and Carbonates|
|Group 8 - Phosphates, Arsenates and Vanadates|
|ⓘ||'Vivianite'||8.CE.40||Fe2+3(PO4)2 · 8H2O|
List of minerals arranged by Dana 8th Edition classification
|Group 2 - SULFIDES|
|AmBnXp, with (m+n):p = 1:2|
|Group 14 - ANHYDROUS NORMAL CARBONATES|
|Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES|
|ⓘ||Vivianite||184.108.40.206||Fe2+3(PO4)2 · 8H2O|
List of minerals for each chemical element
|H||ⓘ Vivianite||Fe32+(PO4)2 · 8H2O|
|O||ⓘ Vivianite||Fe32+(PO4)2 · 8H2O|
|P||ⓘ Vivianite||Fe32+(PO4)2 · 8H2O|
|Fe||ⓘ Vivianite||Fe32+(PO4)2 · 8H2O|
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
2.588 - 66 Ma
|Cenozoic sedimentary rocks|
Age: Cenozoic (2.588 - 66 Ma)
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. 
|Oligocene - Eocene|
23.03 - 56 Ma
|Demons Bluff Group|
Age: Paleogene (23.03 - 56 Ma)
Stratigraphic Name: Demons Bluff Group
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).