Alfonso X's Lapidario: Stones, Stars and Colours

[MarcoP]

this post crossed with Darren's

An update on this investigation.

I've extracted the Chaldean stone names for each Zodiac sign, from the transcription I linked to. The stones for Aries are shown below, as an example. (The whole set is available if anyone wants it.)

There is something I don't understand. The first 12 sections in the Lapidario list the 30 stones for each zodiac sign, but a few signs appear to be truncated: Leo has only one stone, Pisces only has two stones, and Aquarius only 28. I wonder why that is? 

There follow more sections, again one for each sign, but these each have only three stones. I'm not clear what they represent. 

Following those sections are several more that cover the stones of Saturn (4 stones), Jupiter (4 stones), Mars (4 stones), Venus (24 stones), Sun (9 stones) and Mercury (17 stones).

Hi Julian,
the first text was meant to include 360 chapters, but it was not integrally transmitted (about 60 chapters/degrees were lost).

The second text (Sobre las faces de los signos) is about the stones associated with the 36 decans (each of which corresponds to 10 degree of a sign). The decans were usually called "faces" in Latin.

The third text is about the relationship of stones with the seven planets.
conviene agora que sea mostrato el fecho del tercero lapidario en que de parte de como se camian muchas veces las vertudes de las piedras según el estado de las planetas et de las figuras que estan en el ochavo cielo oade ellas reciben la vertud. (we now must present the contents of the third lapidary, about how the virtues of stones change according to the position of the planets and the figures that are in the eight heaven, from which they receive their virtues)

These three parts are actually a fragment of a much larger work which originally included 11 sections.
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Please note that also the first lapidary about the 360 degrees makes reference to the planets as "rulers" of the signs.:

Your list for Aries mentions a stone associated with Mars (the planetary ruler of Aries).
Scorpio (the second domicile of Mars) also has a similar stone (De la piedra que parece en la mar cuando se pone Marte).
Libra has a stone associated with its planetary ruler Venus (De la piedra que parece en la mar cuando se pone Venus).
and so on...