metamorphic
Boxwork Quartz / Septarian Jasper
Boxwork (SiO2 with iron oxide inclusions)
Hardness: 6.5-7.0 (Mohs scale); Color: Brown, tan, and reddish-iron hues; Luster: Dull to waxy; Texture: Reticulated, honeycomb, or 'brick-and-mortar' structure; Cleavage: None/Conchoidal.
- Hardness
- 6
- Color
- Brown, tan, and reddish-iron hues
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7.0 (Mohs scale); Color: Brown, tan, and reddish-iron hues; Luster: Dull to waxy; Texture: Reticulated, honeycomb, or 'brick-and-mortar' structure; Cleavage: None/Conchoidal.
Formation & geological history
Formed through secondary mineralization where silica-rich fluids fill fractures in a host rock (often limestone or carbonate). When the host rock weathers away, the harder quartz-filled cavities remain. Common in Precambrian and Paleozoic formations.
Uses & applications
Primarily used as lapidary material, desk specimens for collectors, and unique landscaping accents. Sometimes used in wire-wrapped jewelry.
Geological facts
This specific texture is often called 'boxwork' and is the primary feature of Wind Cave in South Dakota, where it forms massive ceiling displays. The pattern mimics the appearance of ancient stone walls or reptilian skin.
Field identification & locations
Identify by its distinctive raised, angular ridges that create square or rectangular cells. It is commonly found in desert environments or karst terrains across the Western United States, particularly Utah and South Dakota.
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