Mineral Evolution Database

Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.

Mineral locality data provided by mindat.org

The Mineral Evolution database is currently under development.

The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.

Locality Name:
Rock Island Dam, Douglas Co., Washington, USA

mindat Locality ID: 4214
mindat URL: http://www.mindat.org/loc-4214.html

Tectonic Settings:

Total number of sublocalities beneath "Rock Island Dam, Douglas Co., Washington, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 47°20'36"N
Longitude: 120°5'22"W
Decimal Degree (lat, lon): 47.343333333333,-120.08944444444

A	This mineral is Anthropogenic.
G	This mineral is directly dated.
B	This mineral is reported as having this age.
Y	This mineral is using an age reported as an element mineralization period.
O	This mineral is using an age calculated from all data at the locality.
R	The age displayed for this mineral originates from a different, non-child locality.
P	The age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
	This mineral's age has not yet been recorded.

Amorphous	Calcite	Erionite	Gypsum	Harmotome	Heulandite	None	Not in a structural group	Pyrite

This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.

Elements at this locality, including sub-localities: Al Ba C Ca Fe H K Mg Na O S Si

Elements from minerals reported directly at this locality: Al Ba C Ca Fe H K Mg Na O S Si

Structural Groups for minerals in this locality:
Amorphous Calcite Erionite Gypsum Harmotome Heulandite None Not in a structural group Pyrite

9 IMA Minerals at location:

Calcite ()*	Clinoptilolite-Ca ()*	Erionite-K ()*	Gypsum ()*	Offretite ()*
Opal ()*	Paulingite-K ()*	Phillipsite-K ()*	Pyrite ()*

Mineral name	Structural Groups	IMA Formula	# of localities containing mineral
Calcite ()*	Calcite	Ca(CO₃)	27770
Clinoptilolite-Ca ()*	Heulandite	Ca₃(Si₃₀Al₆)O₇₂·20H₂O	33
Erionite-K ()*	Erionite	K₁₀[Si₂₆Al₁₀O₇₂]·30H₂O	22
Gypsum ()*	Gypsum	Ca(SO₄)·2H₂O	6890
Offretite ()*	Not in a structural group	KCaMg(Si₁₃Al₅)O₃₆·15H₂O	146
Opal ()*	Amorphous	SiO₂·nH₂O	2994
Paulingite-K ()*	None	(K,Ca,Na,Ba, )₁₀(Si,Al)₄₂O₈₄·34H₂O	7
Phillipsite-K ()*	Harmotome	K₆(Si₁₀Al₆)O₃₂·12H₂O	71
Pyrite ()*	Pyrite	FeS₂	39462

No ages have been assigned to this locality yet.

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...