Ferruginous quartz cluster Siderite snaking chalcedony with concentric rings

snaking chalcedony with concentric rings visible

well-formed crystals displaying parallel growth and twinning

Many of these specimens are speckled with small pits on the faces

Approx weight: 320g

Approx weight: 6 lbs 4 oz

Ferruginous quartz cluster Siderite snaking chalcedony with concentric ringsLocale: Morocco Approx dimensions: 4. 5 x 3 x 3", longest crystal 5. 5 cm Approx weight: 627g Known as red or ferruginous (iron bearing) quartz, this unusual variety of quartz gets its color from iron oxides, typically hematite. The quartz in this specimen initially grew colorless; broken crystals along the edge reveal the quartz crystals have a clear core bordered by a thin top layer of brick red quartz. A change occurred during the growth process