Clay-alunite alterated amygdaloidal rhyolite illite smectite dickite nacrite sepiolite Gypsum Palygorskite

Virtual Museum ID: 19-T6-01

Specimen Summary

White; massive; fine grained; light density; bladed crystals evident on one weathered surface. Crystalline, vitreous amygdales are visible throughout specimen, relatively unaltered to clay. Protolith appeats to be a amygdaloidal rhyolite.

Alunite, white clay-like mineral coating the specimen, is a hydroxylated aluminium potassium sulfate mineral often forming from weathering and alteration of felsic volcanics/lavas mainly rhyolite and trachyte with generally high potassium contents.
Alunite has its uses in radiometric dating (K-Ar method) of weathering processes in ore deposits as well as the formation of alunite in caves.

White chalky rock, no obvious original texture noted (hosted in andesite\dacite feldspar porphyry

Specimen Data


The information listed below relates to the current holding location or collection that the sample is from, and whether the item is viewable at that location or is part of a private collection. Coordinates are given as guides, and we remind you that collecting specimens from these locations is not allowed. Caution is advised visiting such sites and Below BC assumes no responsibility for any injuries or trespassing charges that may occur as a result of the viewer entering these sites.

Collection Details

Original Collection:

Smithers Exploration Group (SEG)

Sub Collection:

High Sulfidation Epithermal Gold-Silver veins

Collection ID:

T14-02 T6-01 now T14-02

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Date Added to VM:


Location Information

Sample Origin:

Toodoggone Region, Golden Triangle, BC

Specific Site:

Al prospect, Toodoggone

UTM Easting:


UTM Northing:



09 (NAD 83)

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Specimen Details

VM Category:


Primary Features:

Clay-alunite alterated amygdaloidal rhyolite illite smectite dickite nacrite sepiolite Gypsum Palygorskite

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Advanced Geological Information


The following section provides geological data relating to the specimen or the site it was collected from, when available. Information has been obtained from various sources including private and government datasets but may not be up to date. Any geological time periods or ages listed often relate to the primary geology of the area, and may not be the actual date of an event such as mineral formation.

Geological Formation:

Toodoggone Formation

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Additional Images