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Predictive Mineralogy

Possible unrecorded species at Rouchleau Mine, St. Louis County, Minnesota, 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
QuartzSiO299.69%Ankerite (84.53 %), Calcite (62.43 %), Magnetite (50.54 %), Minnesotaite (60.56 %), Siderite (73.22 %)
PyriteFeS295.96%Ankerite (75.64 %), Calcite (51.16 %), Siderite (66.11 %)
ChalcopyriteCuFeS265.39%Ankerite (62.42 %), Siderite (51.43 %)
GalenaPbS43.27%Ankerite (54.09 %)
SphaleriteZnS42.68%Ankerite (53.36 %)

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
40 : Regional metamorphism (greenschist, amphibolite, granulite facies)

Unique: Minnesotaite
100
36 : Carbonatites, kimberlites, and related igneous rocks0
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47)0
31 : Thermally altered carbonate, phosphate, and iron formations0
17 : Marine authigenic Hadean minerals (see also #24)0
50 : Coal and/or oil shale minerals0
35 : Ultra-alkali and agpaitic igneous rocks0
25 : Evaporites (prebiotic)0
54 : Coal and other mine fire minerals (see also #51 and #56)0
44 : Anoxic microbially mediated minerals (see also #44)0
21 : Chemically precipitated carbonate, phosphate, iron formations0