The most systematic old book of sign stones did not hand Leo a single stone. It set stones against the degrees of the sign, a finer grain than one answer for the whole Lion, and nothing a shop sells now came out of it: not sunstone, the usual reply, nor citrine, tiger’s eye, carnelian, peridot or pyrite.
Some time in the thirteenth century, at the court of Alfonso the Wise in Castile, a group of Jewish scholars translated an Arabic book of stones into Castilian. It survives, and the University of Virginia’s description of it is worth reading slowly: it identifies the origin, the medicinal and the magical properties of stones, and their relation to a degree of a zodiac sign. Not to a sign. To a degree of one.
A sign is thirty degrees wide. A book built to that resolution is doing something the modern lists never attempt, which is to treat the zodiac as a fine ruler rather than a set of twelve boxes with a stone dropped in each. The University of St Thomas, which holds a copy, records the same shape from the other side: the work is divided by the signs of the zodiac, with a stone’s properties described as they relate to a specific sign. This is the most organised sign-stone system the West produced, and it is where a serious history of Leo’s stones has to start, because almost nothing after it is anywhere near as careful.
A book that gave stones to the degree
The Lapidario of Alfonso X is the strongest evidence there is that people once tied stones to the zodiac in earnest, and it is also the clearest evidence that the thread was dropped rather than handed down.
Nothing on a modern Leo shelf comes from it. The book worked at the level of the degree and arrived in the West through Arabic learning, in Castilian, in one royal manuscript. What the twentieth-century crystal trade inherited was something much thinner and much later, and it did not pass through Alfonso’s scholars on the way.
What a degree-level system implies is a claim about precision the modern lists quietly gave up. Alfonso’s book treats the place of a stone in the circle as something a person could be exact about, the way an astronomer is exact about a position, and it carries an origin and a set of uses for each. A tray labelled simply Leo answers a coarser question, and answers it with a confidence the older book never claimed for a whole sign at once.
The three lists that do give Leo a single stone each disagree with the Lapidario, with the modern shelf, and with one another. Cornelius Agrippa, printing his table of correspondences in 1533, gives Leo jasper, on a row that carries the twelve months alongside the twelve signs, so his jasper belongs to July as much as to the Lion. A Spanish treatise printed at Valladolid in 1604, which George Frederick Kunz later reproduced, gives topaz. Kunz’s own list of 1913, the one the modern trade actually descends from, gives onyx. Jasper, topaz, onyx, and then sunstone. Four compilers across four centuries, none of them reading the last, and the stone a shop hands a Leo today appears in none of the older three.
That is the condition of the whole subject, and Leo shows it in an unusually pure form. There was a genuine tradition, it was more sophisticated than the modern one, and it is not the modern one’s parent.
The Sun’s stones, as the planet sources have them
There is one layer here that is documented and datable, and it belongs to the planet rather than the sign.
Leo is ruled by the Sun, an assignment Ptolemy sets out in the second-century Tetrabiblos, and the Sun is the body the Renaissance stone-writers describe most fully. Agrippa, in the first book of the Three Books of Occult Philosophy, gives the Sun its own chapter of stones: the topaz, the chrysoprase, the ruby and the balas ruby, among others he groups with them. The English that circulates is the 1651 translation of the 1533 Latin, so any quotation is being read at one remove.
Set that beside a shop shelf and the two do not meet. The Sun’s stones in Agrippa are gem materials, the kind commissioned into rings by people who could afford goldsmiths. Sunstone, tiger’s eye and pyrite are none of them things anyone in 1533 was writing about, because they reach a Leo list for reasons that have nothing to do with the planet layer. The documented history exists, in other words, and it points somewhere the modern list does not go. A recommendation people can act on has to be built from stones a reader can buy on a Saturday, and that is a different set from the one a Renaissance magus had names for.
This is the part worth holding onto. The planet correspondences are written down and old enough to argue with on their own terms. The sign correspondences, once past the Lapidario, are a handful of lists that disagree. When a shop tells a Leo that a stone is theirs by long tradition, the tradition it can actually point to is the Sun’s, and the Sun’s stones are not the ones in the tray.
The six a shop sells now
Only one of the six modern stones is a straightforward mineral species, and it is the one nobody chose for its mineralogy.
Sunstone leads the list and is not a species at all. It is a feldspar carrying aventurescence, a scatter of tiny reflective platelets that flare and die as the piece turns, and it sits on GIA’s list of heat-sensitive gems that must stay out of an ultrasonic cleaner, next to moonstone, opal, turquoise and lapis lazuli. The name is doing the work. A sign ruled by the Sun collects a stone called sunstone almost without help.
Citrine and tiger’s eye are both quartz. Citrine is quartz in a yellow that is rare enough in the ground that GIA states most of what sells is heat-treated amethyst rather than natural colour, and a name matched to a warm sign carries none of that on its label. Tiger’s eye is quartz threaded with parallel fibres, so a band of light rides across a polished piece as it moves. Carnelian is quartz again at a finer grain, which is what chalcedony is, coloured by iron. Three of the six, then, are one species wearing three textures.
Peridot is gem olivine, and olivine is a series rather than a single species, running between forsterite and fayalite, with gem peridot near the forsterite end at about Mohs 7. It reaches Leo by the calendar, since the sign runs mostly through August and Jewelers of America gives August peridot and spinel. Pyrite is the one valid species on the whole list, iron sulphide, cubic, hardness 6 to 6.5, growing in interlocking cubes so square that people meeting a specimen assume the faces were cut. Where each of these sits among the minerals, as opposed to among the signs, is set out in the Crystalance Mineral Library, arranged by species rather than by shop name.
What the Lapidario actually set against each degree of the Lion is still sitting in the manuscript, never carried across into a list a shop would know, and nobody in the trade has gone back for it.
Sources
- University of Virginia, Center for Global Inquiry and Innovation, on the Lapidario of Alfonso X: cgii.virginia.edu
- University of St Thomas Libraries, on its copy of the Lapidary of Alfonso X: blogs.stthomas.edu
- Ptolemy, Tetrabiblos I.17, Robbins translation, on the houses of the planets: penelope.uchicago.edu
- Cornelius Agrippa, Three Books of Occult Philosophy, Book I ch. XXIII on Solary stones, 1651 translation of the 1533 original: esotericarchives.com
- George Frederick Kunz, The Curious Lore of Precious Stones, 1913, ch. X: gutenberg.org
- GIA, gems that should not go in an ultrasonic cleaner: 4cs.gia.edu
- GIA, treated citrine: gia.edu
- Jewelers of America, birthstones by month: jewelers.org
