Name/Title
CreediteEntry/Object ID
2009.62.240Description
Chemical Composition: Ca3Al2(SO4)(OH2)F8*2H2O
Crystal System: Monoclinic System
Description: Common Name:Creedite
Chemistry:Ca3Al2(SO4)(OH2)F8*2H2O
Class:Sulfates
Subclass:
Group:
Location:Francisco Portillo,West Camp,Santa Eulalia District.Mun.De Aquiles Serdan,Chihuahua,Mexico
DESCRIPTION:Creedite is a rather rare sulfate found as an accessory to highly oxidized ore bodies. It can be confused with cobalt-rich adamite when its color is purple. It lacks adamite's luster, though, and adamite's dome termination is not slanted, as creedite's is. Creedite's purple color is attractive and its crystal form is unique, making creedite a nice mineral collection addition.
PHYSICAL CHARACTERISTICS:
• Color is white, colorless and purple.
• Luster is vitreous.
• Transparency crystals are transparent to translucent.
• Crystal System is monoclinic; 2/m
• Crystal Habits include prismatic crystals with a dome termination whose top edge is slanted with respect to length. Also acicular crystals in radiating groups.
• Cleavage is perfect in one direction.
• Fracture is uneven.
• Hardness is 4.
• Specific Gravity is approximately 2.7+ (average for translucent minerals)
• Streak is white.
• Associated Minerals are limonite, cassiterite, adamite and vanadanite.
• Other Characteristics: color if present is unevenly distributed through the crystals.
• Notable Occurrences include Mapimi, Mexico; Colquiri, Bolivia and Colorado, USA.
• Best Field Indicators are crystal habit, associations and locality.
Fracture: Uneven
Hardness: 4 Fluorite
Luster: Vitreous
Rock Type: Metamorphic
Specific Gravity: 2.7
Streak: WhiteCollection
RAGM Mineral CollectionAcquisition
Accession
2009.62Source or Donor
Museum Collection of MineralsAcquisition Method
DonationDimensions
Width
4 inDepth
4 inLength
6 inLocation
Location
Shelf
CS-I-2Room
Curation StorageBuilding
Crater Rock MuseumDate
January 31, 2024Location
Display Case
DS-10Room
Delmar Smith HallBuilding
Crater Rock MuseumCategory
PermanentMoved By
Curtis GardnerDate
May 10, 2023Notes
Added current location while cleaning shelfLocation
Shelf
Left, LeftRoom
Delmar Smith HallBuilding
Crater Rock MuseumCategory
PermanentMoved By
Rawley WyattDate
March 17, 2015Location
Wall
NorthBuilding
Storage (old gift shop upstairs)Category
PermanentMoved By
Rawley WyattDate
May 16, 2014Location
Container
centerDrawer
bottom tierShelf
north side, north sideWall
centerRoom
Delmar Smith HallBuilding
Crater Rock MuseumCategory
PermanentMoved By
Wendy MondryDate
January 6, 2010Location
Shelf
CenterCabinet
Case # 51Room
Delmar Smith HallBuilding
Crater Rock MuseumCategory
Permanent
