Siderite is a very common mineral, in lustrous or iridescent deep brown forms, rarely in paler brown translucent balls. Generally it is in sheaf-like bundles, occasionally in ‘bow-ties’. It does…
Magnetite, Siderite, Apatite, Chlorite, Chabazite-Na, Orthoclase, Bickers Quarry, New Zealand
Black magnetite octahedra, some with traces of chlorite on their faces, some of which are stepped. Some magnetite crystals are completely encased in chlorite. Blocky orthoclase crystals form part of…
Gypsum, Chabazite-Na, Bickers Quarry, New Zealand
Gypsum tends to usually occur alone or with barite, chabazite-Na and analcime in the more weathered rock. It forms sprays of clear needles, or larger flat crystals. Below: Gypsum, chabazite-Na,…
Chabazite-Na, Bickers Quarry, New Zealand
Chabazite-Na (“herschelite“) crystals are found in many vugs, as single yellowish, cream, white or colourless hexagonal plates, with striated prism faces and matt-finish flat surfaces. Under magnification the flat surfaces…
Chabazite-Na, Bickers Quarry, New Zealand
Chabazite-Na (“herschelite“) crystals are found in many vugs, as single yellowish, cream, white or colourless hexagonal plates, with striated prism faces and matt-finish flat surfaces. Under magnification the flat surfaces…
Apatite, Chabazite-Na, Chlorite, Bickers Quarry, New Zealand
Apatite occurs as fine needles, often coated with brown chlorite. Occasionally it is strung with tiny “herschelite” (chabazite-Na) crystals. Below: Prismatic coated apatite crystal with yellow hexagonal chabazite-Na and orange…
Analcime, Bickers Quarry, New Zealand
Analcime is found as small water-clear trapezohedra, occasionally with white cores, and often with square c-faces. Larger crystals are usually crackled and clouded. It is associated with most other minerals,…
Bickers Quarry, Northland, New Zealand
Bickers Quarry (originally described as Simpkins Quarry) has been owned by Mr. S. Bicker. It is on the north side of Tokatoka Road, a short way east of the junction…
Chabazite-Na, Siderite, Magnetite, Bickers Quarry, New Zealand
Octahedral magnetite crystals with yellowish chabazite and dark brown siderite. Chabazite-Na (“herschelite“) crystals are found in many vugs, as single yellowish, cream, white or colourless hexagonal plates, with striated prism…