metamorphic
Jasper in Quartzite (likely Cinnabar or Iron inclusions)
Silicon dioxide (SiO2) with impurities
Hardness: 6.5-7 on Mohs scale. Color: White or light grey base with red inclusions. Luster: Dull to waxy. Structure: Microcrystalline. Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- White or light grey base with red inclusions
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: White or light grey base with red inclusions. Luster: Dull to waxy. Structure: Microcrystalline. Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. The red spots are often iron oxide (hematite) or cinnabar inclusions trapped during crystallization or secondary fluid infiltration.
Uses & applications
Aesthetics, lapidary arts, decorative gravel, and collectibles. Occasionally used in jewelry as 'pigeon blood' or 'strawberry' quartz cabochons.
Geological facts
Specimens with distinct red spots on a white background are sometimes nicknamed 'St. John's Gold' or simply 'Spotted Quartzite'. If the red spots are cinnabar, the rock contains mercury.
Field identification & locations
Identify in the field by its hardness (it will scratch glass) and its smooth, water-worn texture if found near riverbeds or beaches. Look for the contrast between the opaque white matrix and the sharp red spots.
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