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While externally similar shapes, these two minerals are very different inside.
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Chalcedony from
Moores Mill, Mount Holly Springs, Cumberland County, Pennsylvania, USA


Locality type:Pit
Classification
Species:Quartz var: Chalcedony
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcedony data
Locality Data:Click here to view Moores Mill, Mount Holly Springs, Cumberland County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:133118
Long-form Identifier:1:3:133118:9
GUID (UUID V4):0
Nearest other occurrences of Chalcedony
74.7km (46.4 miles) ⓘNational Limestone Quarry No. 1, Paxtonville, Middleburg Township, Snyder County, Pennsylvania, USA
82.5km (51.3 miles) ⓘDelight Quarry (Soldier's Delight Quarry; Dyer Quarry), Soldiers' Delight ridge, Delight, Baltimore County, Maryland, USA
83.3km (51.7 miles) ⓘDelight, Baltimore County, Maryland, USA
83.6km (51.9 miles) ⓘHarris Mine, Holbrook, Baltimore County, Maryland, USA
84.0km (52.2 miles) ⓘWeir Mine, Holbrook, Baltimore County, Maryland, USA
84.2km (52.3 miles) ⓘUnnamed Ore Bank, Owings Mills, Baltimore County, Maryland, USA
84.5km (52.5 miles) ⓘUnnamed Chalcedony occurrence [1], Holbrook, Baltimore County, Maryland, USA
85.0km (52.8 miles) ⓘChoate Mine, Owings Mills, Baltimore County, Maryland, USA
87.6km (54.4 miles) ⓘReed Mine, Jarretsville-Dublin Mining District, Harford County, Maryland, USA
89.3km (55.5 miles) ⓘMaryland Green Marble Corporation Quarry (Cardiff Serpentine Quarry), Cardiff, Harford County, Maryland, USA
References
 
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