Okaihau quarry, Okaihau, Far North District, Northland Region, New Zealand
Nice group of Siderite crystals from Okaihau, New Zealand. Image width: 7 mm. Collection: Wilfred Moorer, Amsterdam. Photo: Fred Kruijen. See also the GEA issue 1/2009.
© Fred Kruijen
Siderite "bowtie". Collection and photograph of Rod Martin. FOV = ~5.5mm
Collection and photograph of Rod Martin. FOV = ~3.5mm
Trigonally terminated siderite. Collection and photograph of Rod Martin. FOV = ~5.5mm
Opononi, Far North District, Northland Region, New Zealand
A cavity lined with clear colourless analcimes and just a few needles of natrolite. Field of view: 10cm.
© Judy Rowe
Taipa, Far North District, Northland Region, New Zealand
From the Taipa quarry, clustered siderite crystals, translucent and slightly iridescent. Field of view: 5mm.
Te Hapua Quarry, Aupōuri Peninsula, Far North District, Northland Region, New Zealand
Analcime from Te Hapua Quarry.
Kawerua, Far North District, Northland Region, New Zealand
"Worms" of saponite (gray) on ferroan calcite (yellow) overgrowth on partly dissolved calcite (white). 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Siderite crystals,p.w. 4.64 mm,coll.& photo Ko Jansen.
© Ko Jansen
Lanigans Mine, Waikare, Far North District, Northland Region, New Zealand
A blackened cinnabar crystal among creamy valentinite pseudomorphs of stibnite Sony NEX-5 with bellows, extension tubes and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Siderite crystal nice form,p.w. 3.82 mm,coll.& photo Ko Jansen.
Siderite crystals forming a ball,p.w. 5.33 mm,coll.& photo Ko Jansen.
Boxwork of siderite (with some incipient alteration to black hematite) and resorbed calcite to the right. 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Thomsonite crystals 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Chabazite on stilbite. 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Siderite crystals,p.w. 1.92 mm,coll.& photo Ko Jansen.
Siderite crystals ,p.w. 4.07 mm,coll.& photo Ko Jansen.
Siderite on stilbite 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Resorbed calcite crystals in siderite (with some incipient alteration to hematite) boxwork. 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Collection and photograph of Rod Martin.
Clear stilbite crystals with a few white laumontite crystals. 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Siderite crystalls in different forms ,ball , segment and single crystals,p.w. 4.00 mm,coll. and photo Ko Jansen.
Analcime on laumontite 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Small bowties of siderite on levyne with a phacolitic chabazite at centre right. 5MP Chinese unbranded CMOS camera with bellows and FYSCOPE 4X Semi Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection of Brian Humberstone, photograph of Rod Martin.
Etched faces on a partially resorbed calcite crystal in a boxwork of siderite (yellow/brown). 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Baryte blades on siderite 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Fibrous form of thomsonite on stilbite 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Ball of cowlesite 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Bladed calcite with a thin coating of pyrite on a bed of stilbite. 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Phacolitic chabazite, some orange tinted due to deposition of fine grained hematite on grain boundaries. 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Stilbite group on the end of a clay strand covered with heulandite, further down it is wrapped by a siderite ball and to the left of this is a ball of thomsonite blades. 5MP Chinese unbranded CMOS camera with bellows and FYSCOPE 4X Semi Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with ...
Thomsonite crystals. 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Siderite balls on thomsonite with a small cluster of white baryte blades above 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Pyrolusite in an iron stained vugh. 5MP Chinese unbranded CMOS camera with bellows and FYSCOPE 4X Semi Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
© R. J. Martin
Hokianga Harbour, Far North District, Northland Region, New Zealand
Aragonite crystals in voids in a hematite concretion. 5MP Chinese unbranded CMOS camera with bellows and FYSCOPE 4X Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Aragonite spray. 5MP Chinese unbranded CMOS camera with bellows and FYSCOPE 4X Semi Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Calcite on natrolite. 5MP Chinese unbranded CMOS camera with bellows and FYSCOPE 4X Semi Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Fibrous thomsonite on stilbite. 5MP Chinese unbranded CMOS camera with bellows and FYSCOPE 4X Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin
Thomsonite with white laumontite and a few clear stibites. 5MP Chinese unbranded CMOS camera with bellows and FYSCOPE 4X Semi Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Thomsonite on calcite. 5MP Chinese unbranded CMOS camera with bellows and FYSCOPE 4X Semi Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Red and yellow siderite crystals. 5MP Chinese unbranded CMOS camera with bellows and FYSCOPE 4X Semi Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin.
Baryte crystal with a siliceous overgrowth. 5MP Chinese unbranded CMOS camera with bellows and Nikon 4X Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin
© RJ Martin
Goethite (pseudomorphing pyrite) in quartz. 5MP Chinese unbranded CMOS camera with bellows and Nikon 4X Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin
Ngawha geothermal area, Far North District, Northland Region, New Zealand
Red crystals of cinnabar with some minor sulphur on silica sinter. 5MP Chinese unbranded CMOS camera with bellows and Nikon 4X Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone and PhotoScopeX. Collection and photograph of Rod Martin.
Baryte crystals on acid altered rock 5MP Chinese unbranded CMOS camera with bellows and Nikon 4X Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin
Crystalline red cinnabar on acid altered rock (the white material is unanalysed but likely to be a mixture of various aluminous sulphates). 5MP Chinese unbranded CMOS camera with bellows and Nikon 4X Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod ...
An irregular dissolution pit in massive quartz that now has a network of sugary quartz in it. See child photo for an enlarged view. 5MP Chinese unbranded CMOS camera with bellows and Nikon 4X Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin
An enlarged view of the sugary quartz in an irregular dissolution pit in massive quartz. 5MP Chinese unbranded CMOS camera with bellows and Nikon 4X Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. Collection and photograph of Rod Martin
Location map from Courtney (1991)