This document is, at the moment, a working document: a study of 3 phosphates that look alike and can occur together.
This is a work in progress, so it will take a while before I consider it "done".

Every study starts with looking at what has been published.
A list of references, first for the mineral in general (ordered by year of publication), next for the mineral reported at a specific locality (ordered by locality and then by year of publication).
V* = article seen in person; reference verified.

laueite

Crystal morphology

General references:

Geographic references:

pseudolaueite

Crystal morphology
The type description (Strunz 1956) has a crystal drawing and a short list of common and unusual crystal faces.
pseudolaueite is monoclinic, 2/m, the crystals are short-prismatic to tabular on (001)
Common faces are {001}, {100}, {110}, less common are {011}, {-201}


General references:
V* Strunz, H. (1956) Pseudolaueit, ein neues Mineral.
---Die Naturwissenschaften 43, 128. [in German]
V* Fleischer, M. (1956) New mineral names.
---American Mineralogist 41, 814-816. [pseudolaueite p. 815]
V* Baur, W. H. (1969) A comparison of the crystal structures of pseudolaueite and laueite.
---American Mineralogist 54(9-10), 1312-1323.
V* Moore, P. B. (1975) Laueite, pseudolaueite, stewartite and metavauxite: a study in combinatorial polymorphisms.
---Neues Jahrbuch für Mineralogie, Abhandlungen 123(2), 148-159.
V* Anthony, J. W., Bideaux, R. A., Bladh, K. W. & Nichols, M. C. (2000) Handbook of Mineralogy, Vol. IV, p. 476.
V* Keck, Erich (2000) Pseudolaueit-“Aggregate” von Hagendorf-Süd. Der Aufschluss 51(1), 39-45. [in German]
V* Frost, Ray L., Scholz, Ricardo, Wang, Lina (2015) A Raman and Infrared Spectroscopic Study of the Phosphate Mineral
---Pseudolaueite and in Comparison with Strunzite and Ferrostrunzite. Journal of Chemical Crystallography 45(8), 391-400.
---https://doi.org/10.1007/s10870-015-0606-y
V* Mills, S. J. & Grey, I. E. (2015) Nomenclature for the laueite supergroup.
---Mineralogical Magazine 79(2), 243-246.
V* Neumeier, Günther (2018)
---Who's Who in Mineral Names: Max von Laue And the Discovery of X-ray Diffraction by Crystals (1879–1960).
---Rocks & Minerals 93(1), 74-80.

Geographic references:
Germany, Hagendorf:
V* Keck, Erich (2000) Pseudolaueit-“Aggregate” von Hagendorf-Süd. Der Aufschluss 51(1), 39-45. [in German]

stewartite

Crystal morphology

General references:

Geographic references: