Name/Title
Angel Wing AgateEntry/Object ID
78.62.165Description
Chemical Composition: SiO2
Crystal System: Triclinic System
Description: Common Name: Agate (Angel Wing)
Chemistry: SiO2 , Silicon dioxide
Class: Class: Silicates
Location: Prineville, OR.
Description: This an agate stalactite formed by silica that runs down a mountain and solidifies then is shaped by the wind. It is found in clusters in cave or overhangs. Very rare.
Fracture: conchoidal
Hardness: 7 Quartz
Luster: Glassy
Occurrence: Quartz is an essential constituent of granite and other felsic igneous rocks. It is very common in sedimentary rocks such as sandstone and shale and is also present in variable amounts as an accessory mineral in most carbonate rocks. It is also a common constituent of schist, gneiss, quartzite and other metamorphic rocks. Because of its resistance to weathering it is very common in stream sediments and in residual soils.
Quartz occurs in hydrothermal veins as gangue along with ore minerals. Large crystals of quartz are found in pegmatites. Well-formed crystals may reach several meters in length and weigh hundreds of kilograms.
Specific Gravity: 2.65
Streak: white
Variety: Quartz is the most common mineral on the face of the Earth. It is found in nearly every geological environment and is at least a component of almost every rock type. It frequently is the primary mineral, >98%. It is also the most varied in terms of varieties, colors and forms. This variety comes about because of the abundance and widespread distribution of quartz. A collector could easily have hundreds of quartz specimens and not have two that are the same due to the many broad catagories.Collection
Delmar Smith Mineral CollectionAcquisition
Accession
78.62Source or Donor
Delmar Smith Mineral CollectionAcquisition Method
DonationDimensions
Width
8 inLength
4-1/2 inDimension Notes
Dimension taken at widest pointsLocation
Location
Shelf
CS-I-2Room
Curation StorageBuilding
Crater Rock MuseumMoved By
Ian CunninghamDate
December 30, 2022Notes
Moved to storage for future exhibitsLocation
Vault
New Arrivals RoomBuilding
Crater Rock MuseumDate
July 28, 2022Notes
Middle cabinet, Middle shelf second from top