Name/Title
TopazEntry/Object ID
2009.62.220Description
Crystal System: Orthorhombic System
Description: Common Name: Topaz
Chemistry: Al2SiO4(F,OH)2 Aluminum silicate fluoride hydroxide
Class: Silicates
Location: Mandalay,Sagging Division, Mogol, Momeik, Myanmar (Burma)
DESCRIPTION: Clear crystal with gold tone and perfect orthorhombic shape.
PHYSICAL CHARACTERISTICS:
Color is clear, yellow, orange, red, blue and green.
Luster is adamantine to vitreous.
Transparency crystals are transparent to translucent.
Crystal System is orthorhombic; 2/m 2/m 2/m
Crystal Habits include a prismatic crystal with usually two different prisms that produce a rounded or sharp diamond-shaped cross-section. The termination is typically capped by a dome forming a roof like top. Another dome can modify the termination producing a point at the juncture of the two domes. A basal pinacoid can flatten the prisms termination or truncate the top of the domes. The pinacoid, multiple domes and occasionally orthorhombic pyramid faces can produce a complex, multifaceted and well formed termination. Topaz can be granular and massive.
Cleavage is perfect in one direction, basal.
Fracture is conchoidal.
Hardness is 8.
Specific Gravity is approximately 3.4 - 3.5+ (above average)
Streak is white.
Associated Minerals include quartz, tourmalines, micas, brookite, cassiterite and fluorite.
Other Characteristics: index of refraction is 1.61 - 1.64. Prism faces maybe striated lengthwise.
Best Field Indicators are crystal habit, color, density and hardness.
Rock Type: SedimentaryCollection
RAGM Mineral CollectionAcquisition
Accession
2009.62Source or Donor
Museum Collection of MineralsAcquisition Method
DonationDimensions
Width
2 inLength
3-13/16 inLocation
Location
Container
leftDrawer
bottom tierShelf
east side, east sideWall
centerRoom
Delmar Smith HallBuilding
Crater Rock MuseumCategory
PermanentMoved By
Wendy MondryDate
January 6, 2010Location
Container
leftDrawer
bottom tierShelf
east side, east sideWall
centerRoom
Delmar Smith HallBuilding
Crater Rock MuseumCategory
PermanentMoved By
Wendy MondryDate
January 6, 2010Location
Container
Center / FrontDrawer
BottomShelf
LeftCabinet
Case# 30Wall
EastBuilding
Freida Smith HallCategory
Permanent
