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While externally similar shapes, these two minerals are very different inside.
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Muscovite from
Gomersal Mine, Gomersal, Light Regional Council, South Australia, Australia


Locality type:Mine
Classification
Species:Muscovite
Formula:KAl2(AlSi3O10)(OH)2
Comments:Small, fine clear to translucent 'silvery' crystals of muscovite occur mixed within the main ore body. Magnification is require to make out the crystal form in most cases.
Abundance at site:Common
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Muscovite data
Locality Data:Click here to view Gomersal Mine, Gomersal, Light Regional Council, South Australia, Australia
Data Identifiers
Mindat Occurrence Record ID:1427595
Long-form Identifier:1:3:1427595:7
GUID (UUID V4):0
Nearest other occurrences of Muscovite
12.6km (7.8 miles) ⓘPenrice marble quarry, Penrice, Barossa Council, South Australia, Australia
16.3km (10.1 miles) ⓘMoculta Phosphate Quarry, Penrice, Barossa Council, South Australia, Australia
18.1km (11.2 miles) ⓘAustralian Industrial Minerals mine, Williamstown, Barossa Council, South Australia, Australia
18.3km (11.4 miles) ⓘSt Johns Quarry, St Johns, Light Regional Council, South Australia, Australia
18.5km (11.5 miles) ⓘPara River South, Williamstown, Barossa Council, South Australia, Australia
19.8km (12.3 miles) ⓘTom's Quarry, Koonunga, Light Regional Council, South Australia, Australia
19.9km (12.4 miles) ⓘPara Wirra Mica Mine (Para Wirra Mica Deposit), Mount Crawford Forest Reserve, Mount Crawford, Barossa Council, South Australia, Australia
20.5km (12.8 miles) ⓘMount Crawford Forest Reserve, Mount Crawford, Barossa Council, South Australia, Australia
21.6km (13.4 miles) ⓘSailors Gully, Mount Crawford Forest Reserve, Mount Crawford, Barossa Council, South Australia, Australia
25.0km (15.5 miles) ⓘRhine North Mine, Keyneton, Mid Murray Council, South Australia, Australia
References
Mark Willoughby collection
 
and/or  
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