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Toppin Hill, Lake Rason, Laverton Shire, Western Australia, Australiai
Regional Level Types
Toppin HillHill
Lake RasonLake
Laverton ShireShire
Western AustraliaState
AustraliaCountry

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Key
Latitude & Longitude (WGS84):
28° 42' South , 123° 56' East
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:


Guano deposit.

Toppin Hill is approximately 10 kilometres north-west of the western end of the Rason Lake saltpan. It is approximately 200 kilometres east of Laverton in the remote western Gibson Desert. It can be reached from Laverton first south-east along Merolia Road, and then east along Rason Lake Road. It is likely the last is little more than an overgrown two wheel track. No towns, stations or people of any sort exist between Laverton and the location.

The exact location of the type locality material is unclear. The species was discovered by the WA Government Chemical Laboratories in 1973, from an existing specimen labelled Struvite, in the E.S. Simpson collection. This specimen had been donated by a pastorlist and explorer, Frank Hann, who named Toppin Hill in 1906. The locality given was Earles or Earles Find, which the reference notes has not been found on any government record,and does not appear in the public domain now either. If anyone does know, then please update Mindat and you will solve a one hundred year mystery. The reference isn't forthcoming over why Toppin Hill was chosen other than its a locality they can identify with Frank Hann. Considering the vague nature of this, the separate locality of Earles Find has been left on Mindat. Phosphammite listed against this as its type locality actually refers to the same specimen as the one described for Urea under Toppin Hill.

It is thought the specimen would have come from guano in a cave or rock shelter inhabited by bats. It is highly soluable but persists at the location due to low humidity and rainfall. Urea on the specimen occurs as crystals in association with phosphammite, ammonian aphthitalite, and weddellite

The specimen was described as a damp(?) incoherent mass of pyramidal urea crystals 3 x 1mm, translucent, and pale yellow to pale brown. The ammonian aphthitalite was dark brown soft finely crystalline aggregates 1 mm in diameter, which could be shrivelled bat droppings. The phosphammite is sparse transparent crystals 0.5mm grown on the aphthitalite. Weddellite is small amounts of pale yellow crystal aggregates.

Select Mineral List Type

Standard Detailed Gallery Strunz Dana Chemical Elements

Mineral List


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

Detailed Mineral List:

Aphthitalite
Formula: (K,Na)3Na(SO4)2
Reference: Bridge, P.J. (1973) Urea, a new mineral, and neotype phosphammite from Western Australia. Mineralogical Magazine: 39: 346-348.
Phosphammite
Formula: (NH4)2(PO3OH)
Reference: Bridge, P.J. (1973) Urea, a new mineral, and neotype phosphammite from Western Australia. Mineralogical Magazine: 39: 346-348.
Urea (TL)
Formula: CO(NH2)2
Type Locality:
Reference: Bridge, P.J. (1973) Urea, a new mineral, and neotype phosphammite from Western Australia. Mineralogical Magazine: 39: 346-348.
Weddellite
Formula: Ca(C2O4) · (2.5-x)H2O
Reference: Bridge, P.J. (1973) Urea, a new mineral, and neotype phosphammite from Western Australia. Mineralogical Magazine: 39: 346-348.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Aphthitalite7.AC.35(K,Na)3Na(SO4)2
Group 8 - Phosphates, Arsenates and Vanadates
Phosphammite8.AD.20(NH4)2(PO3OH)
Group 10 - Organic Compounds
Urea (TL)10.CA.35CO(NH2)2
Weddellite10.AB.40Ca(C2O4) · (2.5-x)H2O

List of minerals arranged by Dana 8th Edition classification

Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
A2XO4
Aphthitalite28.2.2.1(K,Na)3Na(SO4)2
Group 37 - ANHYDROUS ACID PHOSPHATES, ARSENATES AND VANADATES
Miscellaneous
Phosphammite37.1.3.1(NH4)2(PO3OH)
Group 50 - ORGANIC COMPOUNDS
Oxalates
Weddellite50.1.2.1Ca(C2O4) · (2.5-x)H2O
Miscellaneous
Urea (TL)50.4.6.1CO(NH2)2

List of minerals for each chemical element

HHydrogen
H UreaCO(NH2)2
H WeddelliteCa(C2O4) · (2.5-x)H2O
H Phosphammite(NH4)2(PO3OH)
CCarbon
C UreaCO(NH2)2
C WeddelliteCa(C2O4) · (2.5-x)H2O
NNitrogen
N UreaCO(NH2)2
N Phosphammite(NH4)2(PO3OH)
OOxygen
O UreaCO(NH2)2
O WeddelliteCa(C2O4) · (2.5-x)H2O
O Aphthitalite(K,Na)3Na(SO4)2
O Phosphammite(NH4)2(PO3OH)
NaSodium
Na Aphthitalite(K,Na)3Na(SO4)2
PPhosphorus
P Phosphammite(NH4)2(PO3OH)
SSulfur
S Aphthitalite(K,Na)3Na(SO4)2
KPotassium
K Aphthitalite(K,Na)3Na(SO4)2
CaCalcium
Ca WeddelliteCa(C2O4) · (2.5-x)H2O

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Bridge, P.J.(1973): Urea a New Mineral and Neotype Phosphammite, Mineralogical Magazine (1973):39: 346-348

Other Regions, Features and Areas containing this locality

Australia
Australian PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
 
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