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Predictive Mineralogy

Possible unrecorded species at Contra Costa County, California, USA

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

Possible missing speciesFormulaMatch %Due to recorded presence of
GypsumCaSO4 · 2H2O99.99%Alum-(K) (55.77 %), Alunogen (58.52 %), Copiapite (56.84 %), Coquimbite (54.61 %), Epsomite (63.49 %), Halotrichite (61.51 %), Kornelite (57.14 %), Melanterite (53.56 %), Römerite (63.12 %), Siderotil (63.04 %), Voltaite (63.77 %)
SphaleriteZnS99.68%Chalcopyrite (50.66 %), Marcasite (65.85 %), Melanterite (50.38 %), Millerite (50.48 %), Römerite (56.03 %), Siderotil (64.13 %), Valentinite (52.42 %)
SulphurS881.78%Kornelite (60.71 %), Voltaite (53.62 %)
MalachiteCu2(CO3)(OH)274.38%Chrysocolla (74.38 %)
GalenaPbS73.50%Chalcopyrite (51.07 %), Marcasite (58.73 %), Siderotil (59.78 %)
MercuryHg54.54%Schuetteite (54.55 %)
MagnetiteFe2+Fe3+2O453.37%Actinolite (53.38 %)
ChalcanthiteCuSO4 · 5H2O52.17%Siderotil (52.17 %)

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 ModeScore
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Unique: Hypercinnabar, Metacinnabar
100
47a : Low-𝑇 subaerial oxidative hydration, weathering (see also #16 and #23) - [Near-surface hydration of prior minerals]19
47b : Low-𝑇 subaerial oxidative hydration, weathering (see also #16 and #23) - [Sulfates and sulfites]15
40 : Regional metamorphism (greenschist, amphibolite, granulite facies)10
47d : Low-𝑇 subaerial oxidative hydration, weathering (see also #16 and #23) - [Arsenates, antimonates, selenates, bismuthinates]7
31 : Thermally altered carbonate, phosphate, and iron formations6
55 : Anthropogenic mine minerals6
45a : Oxidized fumarolic minerals (see also [#11]) - [Sulfates, arsenates, selenates, antimonates]5
50 : Coal and/or oil shale minerals4
47h : Low-𝑇 subaerial oxidative hydration, weathering (see also #16 and #23) - [Near-surface oxidized, dehydrated minerals]3
54 : Coal and other mine fire minerals (see also #51 and #56)3