Predictive Mineralogy

Possible unrecorded species at Les Combettes vein, Desges, Brioude, Haute-Loire, Auvergne-Rhône-Alpes, France

This table is based on statistical analysis of other localities containing similar species to the ones found at this locality.

Possible missing species	Formula	Match %	Due to recorded presence of
Calcite	CaCO₃	95.11%	Anglesite (53.86 %), Baryte (51.88 %), Cerussite (50.77 %), Freieslebenite (55.28 %)
Malachite	Cu₂(CO₃)(OH)₂	77.48%	Anglesite (50.35 %), Covellite (54.66 %)
Pyrargyrite	Ag₃SbS₃	62.60%	Freieslebenite (62.60 %)
Acanthite	Ag₂S	53.65%	Freieslebenite (53.66 %)
Chalcocite	Cu₂S	50.30%	Covellite (50.30 %)

Key: Mineral matches key element mineralogy of deposit Key element(s) in mineral not listed for deposit (-20% score)

Predicting paragenetic modes of deposit

Green indicates almost certain match based on minerals unique to a certain deposit type. Yellow indicates a possibly poor match, but should not be entirely discounted. Scores > 100 indicate strong confidence.

Paragenetic Mode	Score
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) Unique: Freibergite Subgroup	100
14 : Hot springs, geysers, and other subaerial geothermal minerals	11
54 : Coal and other mine fire minerals (see also #51 and #56)	2
50 : Coal and/or oil shale minerals	2
47h : Low-𝑇 subaerial oxidative hydration, weathering (see also #16 and #23) - [Near-surface oxidized, dehydrated minerals]	2
47b : Low-𝑇 subaerial oxidative hydration, weathering (see also #16 and #23) - [Sulfates and sulfites]	1
45a : Oxidized fumarolic minerals (see also [#11]) - [Sulfates, arsenates, selenates, antimonates]	1
45b : Oxidized fumarolic minerals (see also [#11]) - [Other oxidized fumarolic minerals]	1
47c : Low-𝑇 subaerial oxidative hydration, weathering (see also #16 and #23) - [Carbonates, phosphates, borates, nitrates]	1
57 : Other minerals formed by human processes	1
12 : Hadean hydrothermal subsurface sulfide deposits (see also #33)	1