Xognosis EsotericaArcane Publishing StudioIn Room 1 of the British Museum, in the Enlightenment gallery, sits a disc of black volcanic glass a little under twenty centimetres across. The label calls it Dr Dee's spirit mirror.
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In Room 1 of the British Museum, in the Enlightenment gallery, sits a disc of black volcanic glass a little under twenty centimetres across. The label calls it Dr Dee's spirit mirror. For centuries that was close to all anyone could say about it: an object tied to John Dee, the Elizabethan mathematician who conversed with angels, with a life before Dee that was simply unknown. In 2021 a team of archaeologists published a geochemical study in the journal Antiquity that settled the question of where it came from, and the answer was not the one legend preferred. The mirror is Mexican obsidian, matching the Pachuca source in Hidalgo, within the Aztec sphere. The object that English magicians used to summon spirits was carved, at some point, in the empire the Spanish were dismantling on the other side of the Atlantic.
The study, by Stuart Campbell, Elizabeth Healey, Yaroslav Kuzmin and Michael Glascock, used portable X-ray fluorescence to examine four obsidian objects held by the British Museum, including the mirror associated with Dee. Every one of them turned out to be Mexican. Dee's mirror and a second mirror matched the Pachuca source; the other two objects, a further mirror and a rectangular slab, matched Ucareo, which lay in Tarascan territory, a rival polity to the Aztecs. The authors' conclusion is plain: "Our geochemical analysis allows us to demonstrate that all the obsidian mirrors in the British Museum are of Mexican origin."
This is a fact of the reproducible kind. Geochemistry fixes where the stone was quarried, and the museum's own record now states the source as confirmed by analysis in 2019. What it does not fix is when the disc was carved. The British Museum dates it tentatively to the fourteenth through sixteenth centuries, and the Antiquity authors note that some early objects sent to Europe were commissioned by Cortés himself, which blurs the line between pre-conquest and post-conquest manufacture.
In central Mexico, obsidian was never merely a material. The study, drawing on the archaeology of the region, summarizes the range of its meanings: "Obsidian was used in many ways, including for medicinal and protective purposes; the reflective appearance acted as a shield against bad spirits, and captured the image and soul of a person."
Circular obsidian mirrors carried a specific religious charge. They belonged, iconographically, to Tezcatlipoca, whose name means "smoking mirror". As the Antiquity authors put it, "He is commonly depicted with circular obsidian mirrors on his head, chest or back, and characteristically replacing his missing foot." The Codex Borgia shows him exactly so, with mirror discs at his temple, chest and foot. This is what can be said with confidence: the mirror in London belongs to a type the Aztecs bound to one of their major gods. Whether this particular disc was ever used in Tezcatlipoca devotion is unknowable, and it would be dishonest to claim otherwise.
How the mirror left Mexico is likewise unknown, but the channel existed from the first years of the conquest. As the study records: "Exactly how and when Dee obtained this object is uncertain. Mirrors feature in several lists of early shipments of artefacts to Hapsburg Europe following the conquest of Mexico (1519–1521), including eight mirrors of various types sent in the care of Diego de Soto (Martínez 1990: no. 37)." Nothing ties this object to that manifest or any other. What the shipment lists prove is that Mexican mirrors were reaching European collectors within a decade of the fall of Tenochtitlan, circulating as curiosities before Dee could have laid hands on one.
When he did acquire it is a matter of competing hypotheses. One window is his student years at Louvain between 1548 and 1550; another is his residence in Bohemia in the early 1580s. Both are scholarly reconstructions, and the study presents them as such.
Dee, born in 1527, served Elizabeth I as a scientific advisor and astrologer from 1558, and by the 1580s had turned toward the supernatural. As Campbell and colleagues write, "By the 1580s, he had become increasingly involved with the supernatural and took various scryers or mediums to communicate with spirits through the use of mirrors or crystals". The most famous of those scryers was Edward Kelley. Their angelic conferences, recorded in Dee's own hand from May 1583, were published in 1659 by Meric Casaubon as A True and Faithful Relation, the book that fixed Dee's posthumous reputation as a magician. Casaubon's preface is elegantly cruel: Dee's "only (but great and dreadful) error being, that he mistook false lying Spirits for Angels of Light, the Divel of Hell (as we commonly term him) for the God of Heaven." Casaubon's stated purpose, he insists, "is not to satisfie curiosity, but to do good, and promote Religion."
One caution belongs here, because the museum-shop phrase "Dr Dee's spirit mirror" invites a false trail. The mirror is not named in Casaubon's published diaries, which record sessions with a shew-stone and the holy table. Readers of the Xognosis editions, Volume I and Volume II, will find the conferences of 1583 and 1584, not the British Museum object. The tie between book and mirror runs through Dee the man and the later tradition, not through the diary text.
So what connects the London disc to Dee at all? Not Dee's own hand. The strongest evidence is a deposition given by one Thomas Hawes in 1624, describing what he had seen in the house of John Pontois, to whom Dee's possessions had passed: "a certain round flat stone like Cristall which Pountis said was a stone which an Angell brought to doctor dye [sic] wherein he did worke and know many strange things". The Antiquity authors judge that "The link gains strong support, however, from a less well-known source from within the decade following Dee's death", while acknowledging that other scholars have raised doubts. Hawes's stone was "like Cristall", which might mean clear rather than black. The attribution is a strong inference, short of proof.
From Pontois the trail is first inferential, then solidly documented. His collection was dispersed in 1625-26, and the Earls of Peterborough most likely acquired the mirror at that point; that step is a reconstruction from the dispersal records. The chain from there is documented: the Peterborough collection passed to Sir John Germain and Lady Elizabeth Germain in 1705, and a gift carried the mirror to Horace Walpole in 1770. Walpole wrote the label still on the leather case: "The Black Stone into which Dr Dee used to call his Spirits". Note what that is: an eighteenth-century antiquary quoting a lost Peterborough catalogue. It is evidence of a tradition, not an eyewitness account.
Satire picked the pair up too. Samuel Butler's Hudibras, published in three parts between 1663 and 1678, mocked Kelley by name: "Kelly did all his feats upon / The Devil's looking-glass, a stone". Butler names Dee in the surrounding lines as well. Those same verses were later copied onto the mirror's case. Four auctions followed: Strawberry Hill in 1842, then the Smyth-Pigott, Londesborough and Magniac sales, until the British Museum purchased the mirror in 1966.
One object, two empires. Carved from Pachuca obsidian in the Aztec sphere, shipped across an ocean as conquest plunder or tribute, it ended its travels as the working tool of an English magus. Neither culture's story alone explains it.
The black disc in the British Museum is Mexican obsidian from the Pachuca source: that is proven. That Dee owned it rests on a 1624 deposition and a chain of tradition, strong but short of proof. Holding both truths at once is what the object now asks of us.
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