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While externally similar shapes, these two minerals are very different inside.
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Glaucophane from
Wall Street Mine (Cincinnati Mine; Nevada Mine), Castle Rock Springs, East Mayacmas Mining District, Lake County, California, USA


Locality type:Mine
Classification
Species:Glaucophane
Formula:◻Na2(Mg3Al2)Si8O22(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Glaucophane data
Locality Data:Click here to view Wall Street Mine (Cincinnati Mine; Nevada Mine), Castle Rock Springs, East Mayacmas Mining District, Lake County, California, USA
Data Identifiers
Mindat Occurrence Record ID:684675
Long-form Identifier:1:3:684675:6
GUID (UUID V4):0
Nearest other occurrences of Glaucophane
32.0km (19.9 miles) ⓘMelitta, Santa Rosa, Sonoma County, California, USA
34.8km (21.6 miles) ⓘRosenhahnite occurrence, Russian River, Cloverdale area, Mendocino County, California, USA
37.7km (23.4 miles) ⓘGuerneville, Guerneville Mining District, Coast Range, Sonoma County, California, USA
42.0km (26.1 miles) ⓘWard Creek [1], Cazadero, Coast Range, Sonoma County, California, USA
42.3km (26.3 miles) ⓘCamp Meeker, Coast Range, Sonoma County, California, USA
43.3km (26.9 miles) ⓘWard Creek [2], Cazadero, Coast Range, Sonoma County, California, USA
50.1km (31.1 miles) ⓘMouth of the Russian River area, Jenner, Russian River Mining District, Coast Range, Sonoma County, California, USA
51.5km (32.0 miles) ⓘValley Ford, Sonoma County, California, USA
52.1km (32.4 miles) ⓘEbabias Creek, Valley Ford, Sonoma County, California, USA
75.6km (47.0 miles) ⓘNicasio, Marin County, California, USA
References
Hanks, Henry Garber (1884), Fourth report of the State Mineralogist: California Mining Bureau. Report 4, 410 pp.: 183
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
 
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