sedimentary
Shiva Lingam (Sandstone Pebble)
Ferruginous Sandstone (SiO2 with Fe-oxides)
Mohs hardness: 6 to 7; Color: tan, grey, or cream with reddish-brown/chocolate banding; Luster: dull to earthy; Texture: fine-grained; Crystal system: trigonal (microcrystalline quartz)
- Hardness
- 6 to 7
- Color
- tan, grey, or cream with reddish-brown/chocolate banding
- Luster
- dull to earthy
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Physical properties
Mohs hardness: 6 to 7; Color: tan, grey, or cream with reddish-brown/chocolate banding; Luster: dull to earthy; Texture: fine-grained; Crystal system: trigonal (microcrystalline quartz)
Formation & geological history
These are crypto-crystalline quartz stones found in the Narmada River in Onkar Mandhata, India. They are formed through the natural tumbling of river currents and often contain iron oxide 'rings' or bands deposited during sedimentary formation.
Uses & applications
Primarily used in spiritual practices, meditation, and as decorative collectibles. Historically used in Hindu temples to represent the deity Shiva.
Geological facts
The stones are considered one of the holiest specimens in India. Each stone is unique in its markings, which are believed to represent the fusion of female and male energy (yoni and lingam).
Field identification & locations
Identified by their ellipsoidal or egg shape, smooth river-worn texture, and distinct iron oxide banding. Found in the Narmada River in India. Collectors look for symmetrical shapes and deep, clear banding.
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