40:
220:
163:
102:, leading to this type of extinction. Since it is not a natural feature of the mineral, bird's eye extinction is not observed in all mica crystals, nor from all angles, but it is quite common, and is used as a diagnostic feature for micas.
48:
140:
98:
planes which split micas up into its characteristic thin sheets. The resulting, slightly roughened surface alters the extinction angle of various parts of the
51:
Granite sample under cross polarized light containing plagioclase, quartz, and mica. The mica in orange here exhibits the bird's eye extinction pattern.
204:
261:
64:
197:
290:
39:
280:
137:
295:
254:
190:
80:
300:
87:
a pebbly appearance as it passes into extinction. This is caused when the grinding tools used to create
17:
247:
76:
28:
285:
95:
231:
174:
144:
99:
274:
91:
88:
170:
114:
118:
138:
Smith
College - Geology 222b - Petrology - Petrographic Data File - Biotite
219:
94:
of precise thickness alter the alignment of the previously perfect basal
27:
This article is about the mineral property. For the type of lumber, see
110:
84:
68:
227:
162:
106:
72:
235:
178:
255:
198:
8:
262:
248:
205:
191:
18:Bird's eye maple (mineral property)
130:
7:
216:
214:
159:
157:
234:. You can help Knowledge (XXG) by
177:. You can help Knowledge (XXG) by
25:
218:
161:
38:
113:(and the magnesium end-member
1:
109:which exhibit this include
317:
213:
156:
26:
63:, is a specific type of
81:petrographic microscope
230:-related article is a
57:Bird's eye extinction
147:Retrieved 2015-07-02
291:Mineralogy concepts
281:Optical mineralogy
143:2013-05-10 at the
75:group under cross
243:
242:
186:
185:
29:Bird's eye figure
16:(Redirected from
308:
296:Mineralogy stubs
264:
257:
250:
222:
215:
207:
200:
193:
165:
158:
148:
135:
61:bird's eye maple
42:
21:
316:
315:
311:
310:
309:
307:
306:
305:
271:
270:
269:
268:
212:
211:
154:
152:
151:
145:Wayback Machine
136:
132:
127:
100:crystal lattice
83:. It gives the
54:
53:
52:
50:
45:
44:
43:
32:
23:
22:
15:
12:
11:
5:
314:
312:
304:
303:
298:
293:
288:
283:
273:
272:
267:
266:
259:
252:
244:
241:
240:
223:
210:
209:
202:
195:
187:
184:
183:
166:
150:
149:
129:
128:
126:
123:
47:
46:
37:
36:
35:
34:
33:
24:
14:
13:
10:
9:
6:
4:
3:
2:
313:
302:
299:
297:
294:
292:
289:
287:
284:
282:
279:
278:
276:
265:
260:
258:
253:
251:
246:
245:
239:
237:
233:
229:
224:
221:
217:
208:
203:
201:
196:
194:
189:
188:
182:
180:
176:
173:article is a
172:
167:
164:
160:
155:
146:
142:
139:
134:
131:
124:
122:
120:
116:
112:
108:
103:
101:
97:
93:
92:thin sections
90:
86:
82:
79:light of the
78:
74:
70:
67:exhibited by
66:
62:
58:
49:
41:
30:
19:
301:Optics stubs
236:expanding it
225:
179:expanding it
168:
153:
133:
104:
89:petrographic
60:
56:
55:
286:Mica group
275:Categories
171:mineralogy
125:References
115:phlogopite
65:extinction
119:muscovite
77:polarized
141:Archived
96:cleavage
69:minerals
111:biotite
105:Common
85:mineral
71:of the
228:optics
117:) and
226:This
169:This
107:micas
59:, or
232:stub
175:stub
73:mica
277::
121:.
263:e
256:t
249:v
238:.
206:e
199:t
192:v
181:.
31:.
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
