Lapis lazuli
Lapis lazuli from Afghanistan in its natural state
General
Category	Metamorphic rock
Formula .mw-parser-output .nobold{font-weight:normal} (repeating unit)	mixture of minerals with lazurite as the main constituent.
Crystal system	None, as lapis is a rock. Lazurite, the main constituent, frequently occurs as dodecahedra
Identification
Color	Blue, or purple, mottled with white calcite and brassy pyrite
Crystal habit	Compact, massive
Fracture	Uneven-Conchoidal
Mohs scale hardness	5–5.5
Luster	dull
Streak	light blue
Specific gravity	2.7–2.9
Refractive index	1.5
Other characteristics	The variations in composition cause a wide variation in the above values.

Lapis lazuli (/ˈlæpɪs ˈlæzjʊli, -laɪ/), or lapis for short, is a deep blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color. As early as the 7th millennium BCE, lapis lazuli was mined in the Sar-i Sang mines,^[1] in Shortugai, and in other mines in Badakhshan province in northeast Afghanistan.^[2] Lapis was highly valued by the Indus Valley Civilisation (3300–1900 BC). Lapis beads have been found at Neolithic burials in Mehrgarh, the Caucasus, and even as far from Afghanistan as Mauritania.^[3] It was used in the funeral mask of Tutankhamun (1341–1323 BCE).^[4]

At the end of the Middle Ages, lapis lazuli began to be exported to Europe, where it was ground into powder and made into ultramarine, the finest and most expensive of all blue pigments. It was used by some of the most important artists of the Renaissance and Baroque, including Masaccio, Perugino, Titian and Vermeer, and was often reserved for the clothing of the central figures of their paintings, especially the Virgin Mary.

Today, mines in northeast Afghanistan are still the major source of lapis lazuli. Important amounts are also produced from mines west of Lake Baikal in Russia, and in the Andes mountains in Chile. Smaller quantities are mined in Italy, Mongolia, the United States, and Canada.^[5]

Etymology[edit]

Lapis is the Latin word for "stone" and lazulī is the genitive form of the Medieval Latin lazulum, which is taken from the Arabic لازورد lāzaward, itself from the Persian لاجورد lājevard, which is the name of the stone in Persian^[6] and also of a place where lapis lazuli was mined. "Lazulum" is etymologically related to the color blue and used as a root for the word for blue in several languages, including Spanish and Portuguese "azul".^[7][8]

Science and uses[edit]

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  A sample from the Sar-i Sang mine in Afghanistan, where lapis lazuli has been mined since the 7th Millennium BC
  

  
  

  
  


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  A polished block of lapis lazuli
  

  
  

  
  


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  Natural ultramarine pigment made from ground lapis lazuli. During the Middle Ages and Renaissance it was the most expensive pigment available (gold being second) and was often reserved for depicting the robes of Angels or the Virgin Mary
  

  
  

  
  


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  19th Century lapis lazuli and diamond pendant
  

  
  

  
  

Composition[edit]

The most important mineral component of lapis lazuli is lazurite^[9] (25% to 40%), a feldspathoid silicate mineral with the formula (Na,Ca)₈(AlSiO₄)₆(S,SO₄,Cl)_1-2.^[10] Most lapis lazuli also contains calcite (white), sodalite (blue), and pyrite (metallic yellow). Some samples of lapis lazuli contain augite; diopside; enstatite; mica; hauynite; hornblende, nosean, and sulfur-rich löllingite geyerite.

Lapis lazuli usually occurs in crystalline marble as a result of contact metamorphism.

Color[edit]

The intense blue color is due to the presence of the trisulfur radical anion (S
₃^-) in the crystal.^[11] An electronic excitation of one electron from the highest doubly filled molecular orbital (No. 24) into the lowest singly occupied orbital (No. 25)^[12] results in a very intense absorption line at λ_max ~617 nm.

Sources[edit]

Lapis lazuli is found in limestone in the Kokcha River valley of Badakhshan province in northeastern Afghanistan, where the Sar-e-Sang mine deposits have been worked for more than 6,000 years.^[13] Afghanistan was the source of lapis for the ancient Egyptian and Mesopotamian civilizations, as well as the later Greeks and Romans. Ancient Egyptians obtained this material through trade from Afghanistan with the Aryans. During the height of the Indus Valley Civilisation about 2000 BCE, the Harappan colony now known as Shortugai was established near the lapis mines.^[3]

According to the Sorbonne's mineralogist Pierre Bariand's leading work on the sources of lapis lazuli in modern times, and to references in Afghanistan's Blue Treasure: Lapis Lazuli (2011) by Lailee McNair Bakhtiar, the lapis lazuli is found in "caves" not traditionally considered "mines" and the stone lapis lazuli is from the primary source of the Hindu Kush Mountains in Afghanistan's Kochka River Valley and not in Pakistan.^{[citation needed]}

In addition to the Afghan deposits, lapis is also extracted in the Andes (near Ovalle, Chile); and to the west of Lake Baikal in Siberia, Russia, at the Tultui Lazurite deposit. It is mined in smaller amounts in Angola; Argentina; Burma; Pakistan; Canada; Italy, India; and in the United States in California and Colorado.^[5]

Uses and substitutes[edit]

Lapis takes an excellent polish and can be made into jewelry, carvings, boxes, mosaics, ornaments, small statues, and vases. During the Renaissance, Lapis was ground and processed to make the pigment ultramarine for use in frescoes and oil painting. Its usage as a pigment in oil paint largely ended in the early 19th century when a chemically identical synthetic variety became available.

Lapis lazuli is commercially synthesized or simulated by the Gilson process, which is used to make artificial ultramarine and hydrous zinc phosphates.^[14] It may also be substituted by spinel or sodalite, or by dyed jasper or howlite.^[15]

History and art[edit]

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  A lapis lazuli bowl from Iran (End of 3rd, beginning 2nd millennium BCE)
  

  
  

  
  


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  Tsarevich (Fabergé egg). The gold motifs cover the joints, making the egg look as if it was carved from a single block of lapis lazuli
  

  
  

  
  


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  In the funeral mask of Tutankhamun (1341-1323 BCE), lapis lazuli was used for the eyebrows of the young Pharaoh
  

  
  

  
  


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  Carved lapis lazuli mountain scene, from the Chinese Qing Dynasty (1644–1912)
  

  
  

  
  

In the ancient world[edit]

Naqada I (Egypt) female figure, circa 3700 BCE. Bone with Lapis inlay from Badakhshan.

Lapis lazuli has been mined in Afghanistan and exported to the Mediterranean world and South Asia since the Neolithic age.^[16] Lapis lazuli beads have been found at Mehrgarh, a neolithic site near Quetta in Pakistan,^[17] on the ancient trade route between Afghanistan and the Indus Valley, dating to the 7th millennium BCE. Quantities of these beads have also been found at 4th millennium BCE settlements in Northern Mesopotamia, and at the Bronze Age site of Shahr-e Sukhteh in southeast Iran (3rd millennium BCE). A dagger with a lapis handle, a bowl inlaid with lapis, and amulets, beads, and inlays representing eyebrows and beards, were found in the Royal Tombs of the Sumerian city-state of Ur from the 3rd Millennium BCE.^[16]

Lapis was also used in ancient Mesopotamia by the Akkadians, Assyrians, and Babylonians for seals and jewelry. In the Mesopotamian poem the Epic of Gilgamesh (17th-18th Century BCE), one of the oldest known works of literature, lapis lazuli is mentioned several times. The Statue of Ebih-Il, a 3rd millennium BCE statue found in the ancient city-state of Mari in modern-day Syria, now in the Louvre, uses lapis lazuli inlays for the irises of the eyes.^[18]

In ancient Egypt, lapis lazuli was a favorite stone for amulets and ornaments such as scarabs. Lapis jewelry has been found at excavations of the Predynastic Egyptian site Naqada (3300–3100 BCE). At Karnak, the relief carvings of Thutmose III (1479-1429 BCE) show fragments and barrel-shaped pieces of lapis lazuli being delivered to him as tribute. Powdered lapis was used as eyeshadow by Cleopatra.^[3][19]

Jewellery made of lapis lazuli has also been found at Mycenae attesting to relations between the Myceneans and the developed civilizations of Egypt and the East.^[20]

In late classical times and as late as the Middle Ages, lapis lazuli was often called sapphire (sapphirus in Latin, sappir in Hebrew),^[21] though it had little to do with the stone today known as the blue corundum variety sapphire. In his book on stones, the Greek scientist Theophrastus described "the sapphirus, which is speckled with gold," a description which matches lapis lazuli.^[22]

There are many references to sapphires in the Old Testament, but most scholars agree that, since sapphire was not known before the Roman Empire, they most likely are references to lapis lazuli. For instance, Exodus 24:10: "And they saw the God of Israel, and there was under his feet as it were a paved work of a sapphire stone.." (KJV). The term used in the Latin Vulgate Bible in this citation is "lapidus sapphiri," the term for lapis lazuli.^[23] Modern translations of the Bible, such as the New Living Translation Second Edition,^[24] refer to lapis lazuli in most instances instead of sapphire.

See also[edit]

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  Lapis armenus – A variety of precious stone, resembling lapis lazuli, except that it is softer, and instead of veins of pyrite, is intermixed with green


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  Lazurite – A feldspathoid and a member of the sodalite group


• Dvārakā–Kamboja route


• Sar-i Sang


• Shades of blue


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  List of minerals – A list of minerals for which there are articles on Wikipedia

References[edit]

Notes and citations[edit]

Bibliography[edit]

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  Bowersox, Gary W.; Chamberlin, Bonita E. (1995). "Gemstones of Afghanistan". Tucson, AZ: Geoscience Press..


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  Oldershaw, Cally (2003). "Firefly Guide to Gems". Toronto: Firefly Books..


• Bariand, Pierre, "Lapis Lazuli", Mineral Digest, Vol 4 Winter 1972.


• Lapparent A.F., Bariand, P. et Blaise, J., "Une visite au gisement de lapis lazuli de Sar-e-Sang du Hindu Kouch, Afghanistan," C.R. Somm.S.G.P.p. 30, 1964.


• Wise, Richard W., Secrets Of The Gem Trade, The Connoisseur's Guide To Precious Gemstones, 2016
  ISBN 9780972822329
  


• Wyart J. Bariand P, Filippi J., "Le Lapis Lazuli de Sar-e-SAng", Revue de Geographie Physique et de Geologie Dynamique (2) Vol. XIV Pasc. 4 pp. 443–448, Paris, 1972.


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  Herrmann, Georgina, "Lapis Lazuli: The Early Phases of Its Trade", Oxford University Dissertation, 1966.


• Bakhtiar, Lailee McNair, Afghanistan's Blue Treasure Lapis Lazuli, Front Porch Publishing, 2011
  ISBN 978-0615573700
  


• Korzhinskij, D.S., "Gisements bimetasomatiques de philogophite et de lazurite de l'Archen du pribajkale", Traduction par Mr. Jean Sagarzky-B.R.G.M., 1944.

External links[edit]

Wikimedia Commons has media related to Lapis lazuli.

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  [2] Lapis lazuli at Gemstone.org


• Documentation from online course produced by University of California at Berkeley


• Lapislazuli : Occurrence, Mining and Market Potential of a blue Mineral Pigment


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   "Lapis Lazuli" . The New Student's Reference Work . 1914.
  


• The Atlantic, January 2019, Why a Medieval Woman Had Lapis Lazuli Hidden in Her Teeth