Predictive Mineralogy

Possible unrecorded species at Unnamed Hg occurrence [3], Redwood City, San Mateo 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 species	Formula	Match %	Due to recorded presence of
Quartz	SiO₂	96.51%	Calomel (60.00 %), Cinnabar (52.07 %), Eglestonite (53.85 %), Montroydite (60.61 %)
Calcite	CaCO₃	82.59%	Eglestonite (58.97 %), Montroydite (57.58 %)
Pyrite	FeS₂	80.45%	Calomel (57.00 %), Montroydite (54.55 %)
Metacinnabar	HgS	80.18%	Eglestonite (56.41 %), Montroydite (54.55 %)
Terlinguaite	[Hg₃]⁴⁺Hg²⁺Cl₂O₂	53.84%	Eglestonite (53.85 %)

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
47g : Low-𝑇 subaerial oxidative hydration, weathering (see also #16 and #23) - [Halogen-bearing surface weathering minerals] Unique: Calomel	113
47h : Low-𝑇 subaerial oxidative hydration, weathering (see also #16 and #23) - [Near-surface oxidized, dehydrated minerals] Unique: Montroydite	100
47a : Low-𝑇 subaerial oxidative hydration, weathering (see also #16 and #23) - [Near-surface hydration of prior minerals]	13
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])	5
6 : Secondary asteroid phases	5
14 : Hot springs, geysers, and other subaerial geothermal minerals	4
56 : Slag and smelter minerals (see also #51 and #55)	1
12 : Hadean hydrothermal subsurface sulfide deposits (see also #33)	1
11 : Volcanic fumarole minerals; reduced phases (see also #45)	1