Stilbite

Object/Artifact

-

Crater Rock Museum

Stilbite

Stilbite

Name/Title

Stilbite

Entry/Object ID

2009.62.60

Description

Chemical Composition: NaCa2Al5Si13O36 -14H2O Crystal System: Monoclinic System Description: Common Name: Stilbite Chemistry: NaCa2Al5Si13O36 -14H2O, Hydrated sodium calcium aluminum silicate Group: Silicates Location: Midway Quarry, Butte Falls, Jackson County, Oregon Description: Large specimen with tan to burnt orange elongated crystals varying in size from short to long with some small, druzy white to gray crystals in the vicinity. The matrix is brown to gray and covers a large area. Physical Characteristics: Color is pink or white; also tinted yellow and red. Luster is vitreous to pearly especially on the prominant pinacoid and cleavage surfaces. Transparency: crystals are transparent to mostly translucent. Crystal System is monoclinic; 2/m Crystal Habits include platy often thin crystals that can aggregate together into a wheat sheaflike structure. The prominant pinacoid is sometimes but rarely modified by other pinacoid and prism faces. Cruciform (cross-like) twins can also be found. Also forms radiating nodules. Cleavage is perfect in one direction parallel to the prominant pinacoid. Fracture is uneven. Hardness is 3.5 - 4. Specific Gravity is approximately 2.2 (very light) Streak is white. Associated Minerals are quartz, calcite, babingtonite, apophyllite, heulandite, natrolite and other zeolites. Best Field Indicators are crystal habit, luster, density and associations. Fracture: conchoidal Hardness: 4 Flourite Luster: Vitreous Occurrence: Stilbite commonly forms nice crystals inside the petrified bubbles (called vesicles) of volcanic rocks that have undergone a small amount of metamorphism. Specific Gravity: 2.2 Streak: white Texture: Crystalline Variety: Stilbite is a mineral of secondary origin, and occurs with other zeolites in the amygdaloidal cavities of basaltic volcanic rocks; it is sometimes found in granite and gneiss, and exceptionally in hydrothermal veins.

Collection

RAGM Mineral Collection

Acquisition

Accession

2009.62

Source or Donor

Museum Collection of Minerals

Acquisition Method

Donation

Dimensions

Width

11 in

Depth

5-1/4 in

Length

15 in

Weight

7.34 oz

Dimension Notes

Dimension taken at widest points

Location

Location

Display Case

DS-6

Room

Delmar Smith Hall

Building

Crater Rock Museum

Category

Permanent

Moved By

Curtis Gardner

Date

May 24, 2023

Notes

Added current location