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Howlite

Pictures (6 Images total)

Howlith-Aggregat
Views (File:
1167273690
): 7403
Howlith-Aggregat
Größe: 0,8 cm; Fundort: Bras D'Or Lake, Iona, Nova Scotia, Kanada
Copyright: Sandro Maggia; Contribution: slugslayer
Location: Kanada/Nova Scotia/Victoria Co./Cape Breton/Iona/Bras D'Or Lake
Mineral: Howlite
Image: 1167273690
Rating: 8 (votes: 1)
License: Usage for Mineralienatlas project only
Howlith-Aggregat

Größe: 0,8 cm; Fundort: Bras D'Or Lake, Iona, Nova Scotia, Kanada

Copyright: Sandro Maggia
Contribution: slugslayer 2006-12-28
Locality: Bras D'Or Lake / Iona / Cape Breton / Victoria Co. / Nova Scotia / Kanada
Howlith
Views (File:
1181327137
): 6930
Howlith
Fundort: Bras D'Or Lake, Iona, Cape Breton Island, Victoria Co.,Kanada; Foto Stephan Wolfsried
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Kanada/Nova Scotia/Victoria Co./Cape Breton/Iona/Bras D'Or Lake
Mineral: Howlite
Image: 1181327137
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Howlith

Fundort: Bras D'Or Lake, Iona, Cape Breton Island, Victoria Co.,Kanada; Foto Stephan Wolfsried
Copyright: Stephan Wolfsried
Contribution: Hg 2007-06-08
Locality: Bras D'Or Lake / Iona / Cape Breton / Victoria Co. / Nova Scotia / Kanada
Howlith
Views (File:
1270326679
): 5898
Howlith
Größe: 40x28 mm; Fundort: Tick Canyon, Lang, Los Angeles Co., Kalifornien, USA
Copyright: John Sobolewski; Contribution: slugslayer
Location: USA/Kalifornien (California)/Los Angeles Co./Lang/Tick Canyon
Mineral: Howlite
Image: 1270326679
License: Usage for Mineralienatlas project only
Howlith

Größe: 40x28 mm; Fundort: Tick Canyon, Lang, Los Angeles Co., Kalifornien, USA
Copyright: John Sobolewski
Contribution: slugslayer 2010-04-03
Locality: Tick Canyon / Lang / Los Angeles Co. / Kalifornien (California) / USA
Howlith
Views (File:
1307260687
): 5049
Howlith
Größe: 49 mm; Fundort: Wentworth, Hants Co., Nova Scotia, Kanada
Copyright: Rock Currier; Contribution: slugslayer
Collection: Royal Ontario Museum
Location: Kanada/Nova Scotia/Hants Co./Wentworth
Mineral: Howlite
Image: 1307260687
License: Usage for Mineralienatlas project only
Howlith

Größe: 49 mm; Fundort: Wentworth, Hants Co., Nova Scotia, Kanada
Collection: Royal Ontario Museum
Copyright: Rock Currier
Contribution: slugslayer 2011-06-05
Locality: Wentworth / Hants Co. / Nova Scotia / Kanada
Howlith
Views (File:
1350924586
): 2920
Howlith
Howlith , Größe: 40mm x 25mm , Deutschland/Thüringen/Nordhausen, Landkreis/Niedersachswerfen (Steinbruch am Kohnstein)
Copyright: alihofi; Contribution: alihofi
Collection: alihofi
Location: Deutschland/Thüringen/Nordhausen, Landkreis/Nordhausen/Salza/Steinbruch am Kohnstein
Mineral: Howlite
Image: 1350924586
License: Usage for Mineralienatlas project only
Howlith

Howlith , Größe: 40mm x 25mm , Deutschland/Thüringen/Nordhausen, Landkreis/Niedersachswerfen (Steinbruch am Kohnstein)
Collection: alihofi
Copyright: alihofi
Contribution: alihofi 2012-10-22
Locality: Steinbruch am Kohnstein / Salza / Nordhausen / Nordhausen, Landkreis / Thüringen / Deutschland
Howlith
Views (File:
1669393685
): 15
Howlith
Steinbruch am Kohnstein, Salza, Nordhausen, Thüringen. BB 10cm
Copyright: Doc Diether; Contribution: Doc Diether
Collection: Doc Diether
Location: Deutschland/Thüringen/Nordhausen, Landkreis/Nordhausen/Salza/Steinbruch am Kohnstein
Mineral: Howlite
Image: 1669393685
License: Usage for Mineralienatlas project only
Howlith

Steinbruch am Kohnstein, Salza, Nordhausen, Thüringen. BB 10cm
Collection: Doc Diether
Copyright: Doc Diether
Contribution: Doc Diether 2022-11-25
Locality: Steinbruch am Kohnstein / Salza / Nordhausen / Nordhausen, Landkreis / Thüringen / Deutschland

Collectors Summary

Color beige, weiß
Streak color weiß
Lustre Glasglanz bis Erdig
Hardness (Mohs) 3.4 massiv, 6.5 als Kristalle
Solubility +++ Säuren, + H2O
Crystal System monoklin, P21/c

Chemism

Chemical formula

Ca2B5SiO9(OH)5

Chemical composition

Calcium, Silicium, Bor, Sauerstoff, Wasserstoff

Unit weight: 391.332585 u; Number of atoms in the formula: 27

Info

Empirical formula:

Ca2B5SiO9(OH)5

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.29

5

18.52

1.0079470

5.0397350
Boron

B

13.81

5

18.52

10.8117000

54.0585000
Oxygen

O

57.24

14

51.85

15.9994300

223.9920200
Silicon

Si

7.18

1

3.70

28.0855300

28.0855300
Calcium

Ca

20.48

2

7.41

40.0784000

80.1568000

Analysis wt%

CaO : 29.22, SiO2 : 15.31, B2O3 : 44.32, H2O : 11.44 (Ref: Dana, 7th ed. 2)

Strunz 9th edition incl. updates

6.CB.20

6: Borate
C: Triborate
B: Ketten u. Band (Ino)-Triborate
20:Howlith-Gruppe

Lapis Classification

VIII/F.28-010

VIII: SILIKATE
F: Ketten- und Bandsilikate
28: Sechserketten [Si6O18] 12- und Sechserbänder [Si12O30] 12-

Classification by Hölzel

6.CB.200

6: Borates
C: Triborates
B: Inotriborates
2: Howlite-Group - 3(P+2T)+2T (bridged unit)

Dana 8th edition

25.03.05.01

25: Anhydrous Borates Containing Hydroxyl or Halogen
03: Anhydrous Borates Containing Hydroxyl or Halogen

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

beige, weiß

Streak color

weiß

Lustre

Glasglanz bis Erdig

max. Birefringence

0.020
Birefringence chart\! Howlite title=Birefringence chart Howlite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.585

RI value β

1.597

RI value γ / ε

1.605

Ri mean

1.596

2V angle

Biaxial (-) 73°

Optical Data Luminescence

Color LW-UV (365nm)

  

orange

Color SW-UV (254nm)

  

orange

LW-UV Other Colors

  

bläulich weiß

SW-UV Other Colors

  

bläulich weiß

Most Common Activator

Eu2+

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/c

Cell parameters a (Å)

12.820

Cell parameters b (Å)

9.351

Cell parameters c (Å)

8.608

Cell parameters a/b or c/a

1.371

Cell parameters c/b

0.921

Cell parameters α

90°

Cell parameters β

104.83

Cell parameters γ

90°

Z

4

Volumne (ų)

997.552

X-Ray Powder Diffraction

12.4(40),
6.2(100),
4.13(40),
3.90(80),
3.099(90),
2.069(50),
2.036(70),
1.794(50)
XRD chart Howlite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3.4 massiv, 6.5 als Kristalle

VHN (Hardness Vickers)

130 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.58

2.606 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren, + H2O

(Co-)Type locality

(Co-)Type locality

Kanada/Nova Scotia/Hants Co./Windsor/Brookville

Preface

Author (Name, Year)

Dana, 1868

Relevance, Usage

Für Türkisimitate

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 349

Other languages

Spanish

Howlita

French

Howlite

English

Howlite

German

Howlith

Russian

Говлит

Alternative Name

Howelite

German

Howlit

German

Khaulit

Spanish

Khaulita

Khaulite

German

Silicoborocalcit

Spanish

Silicoborocalcita

Silicoborocalcite

CNMNC symbol

Symbol

How

Locations with GPS information