Aluminite

White chalky Aluminite nodule Acquired from Galerie Ammoniet Specimen deacquisitioned

6.6 x 6.6 x 4.2 cm. Aluminite is a lesser known hydrated aluminum sulfate hydroxide and according to Mindat is found "as concretionary deposits in Tertiary to Quaternary clays, marls, and lignites, formed by the action of sulfate solutions derived from the decay of pyrite or marcasite on aluminous silicates. Typically in clays or lignites, formed ...

© Rob Lavinsky & irocks.com

Radial aggregate of aluminite on gypsum. Note dehydration cracks within aluminite crystals, developed soon after removal from the original mine environment (photo taken in low vacuum).

© Dalibor Matýsek, 2018

7.5x5x5cm Aluminite nodule. Self collected. Bill Gordon collection.

© Bill Gordon

White nodule of aluminite, 4 cm in diameter. From the type locality. Photographer and collection Thomas Witzke.

© Thomas Witzke and Abraxas-Verlag

A nodular mass of white earthy, powdery aluminite 5 x 4,5 cm. Obtained by trade in 1980. Knut Edvard Larsen photo & collection (# 701)

© Knut Edvard Larsen

White aluminite nodule. Overall size:132*95*48mm

© Tamás Ungvári Collection

Aluminite - close-up of a loose chalky globular specimen.

© Christopher O'Neill

A 4 cm nodule of aluminite. Material is soft, note the fingerprint impressions close to the bottom! S011-09 Excalibur Mineral Company specimen.

© 2010, JGW

Aluminite - close-up of a loose chalky globular specimen.

© Christopher O'Neill

White, dull, fine-grained aggregate. Diameter of the specimen: 6 cm. Collection of Herman Ottó Museum, Miskolc, Hungary (catalogue No. 19291).

© Sándor Szakáll

No, it is not a petrified human brain. It is a big aluminite aggregate stained with iron oxide. Collection of Herman Ottó Museum, Miskolc, Hungary (catalogue No. 16218).

© Sándor Szakáll

White aluminite spheres on clay matrix from the northern clay pit. Field of view: 5 mm.

© Andreas Gerstenberg

Size: 3 X 2 cm Collection and photo: Arliguie M

© Arliguie M

6.6 x 6.6 x 4.2 cm. Aluminite is a lesser known hydrated aluminum sulfate hydroxide and according to Mindat is found "as concretionary deposits in Tertiary to Quaternary clays, marls, and lignites, formed by the action of sulfate solutions derived from the decay of pyrite or marcasite on aluminous silicates. Typically in clays or lignites, formed ...

© Rob Lavinsky & irocks.com

4,5 x 3,5 cm aluminite aggregate from the type locality. Former Philadelphia Academy of Natural Sciences.

© Andreas Gerstenberg

6.6 x 6.6 x 4.2 cm. Aluminite is a lesser known hydrated aluminum sulfate hydroxide and according to Mindat is found "as concretionary deposits in Tertiary to Quaternary clays, marls, and lignites, formed by the action of sulfate solutions derived from the decay of pyrite or marcasite on aluminous silicates. Typically in clays or lignites, formed ...

© Rob Lavinsky & irocks.com

Nodule from the gault clay.

Small creamy-white Aluminite pebble Acquired from Elise Chaigneau on eBay on 18 November 2020

Microcrystals of aluminite constituting a larger, typical, rounded/botryoidal aggregate. Some gypsum may likely be associated (?). Photo layer composing/stacking used.

© Łukasz Kruszewski 2021

White aluminite from Creston, Wyoming. Label states that this is from a railroad cutting between Creston and Wamsutter. Chris Emproto collection and photo.

© Chris Emproto

Aluminite on calcite matrix with small muscovite ‘books’.

© Ion Cotaescu

Rich Zn Aluminite on goethite. RM3261.

© Joan Rosell.

Typical specimen of aluminite, extremely powdery, fluorescent white/light blue under longwave UV light. Longwave fluorescence.

© Simone Conti

Microcrystals of aluminite constituting a larger, typical, rounded/botryoidal aggregate. Some gypsum may likely be associated (?). Photo layer composing/stacking used.

© Łukasz Kruszewski 2021

Aluminite crystals of various sizes are the product of acid mine drainage.

© Dalibor Matýsek, 2018

Typical, nodular, white, fine-grained aluminite without matrix. Ex-Dr Dieter Bartnik collection, from the type locality (see child photo). Purchased in 2022.

© Andrew Hodgson

White chalky Aluminite nodule from Newhaven Cliffs in East Sussex, England, UK. Specimen and Photograph - James Melville (2023)

A small lightweight reniform piece of aluminite from Newhaven, Sussex, England. Was purchased from a rock shop in Scarborough, Yorkshire.

© N.P. Harrison